Unfortunately, Dave Romney passed away not long ago, and his daughter sold the farm. The only reliable source that I know of right now in Florida is the USDA germplasm repository in Miami, but they only have unsprouted coconuts at the moment.

Thanks buddy!

As far as Universal Supply in Broward  goes---  Universal Enterprises Supply Corp.  -they also have a website
Address: 2171 Blount Rd, Pompano Beach, FL 33069
 Phone: (954) 979-0600
____________________

They have 50lbs of 0 0 52 Potassium Sulfate. This is quick dissolve and used by "the palm tree guys" to quote them. $32.50 per bag and they should usually have this in stock
I asked about the granular version. He said he would get back to me on what the minimum order of bags would be.

If I cannot get a minimum order going with members here then I will buy their quick dissolve powder that is typically used in irrigation systems.  And just toss a little bit on top of my mango tree's mulch every two weeks. And definitely wear a respirator when doing so.

Amazon respirators ...a  must use if dealing with tree trimmer's mulch which puts out mold spores when you handle it.
https://www.amazon.com/respirator/s?ie=UTF8&page=1&rh=i%3Aaps%2Ck%3Arespirator

Looks like I was typing while your post got published 

Wow! Not good at all. I do have several papaya trees and sometimes the papayas over-ripe on the tree, so I should consider myself very lucky when it comes to critters eating my papayas. My problem is with squirrels eating my mangos, but somehow they're not interested at all in eating the papayas.
My house is next to a canal, so at night time I get huge frogs that come to hang around the house to eat whatever shows up that will fit in their mouth and I'm pretty sure that rats could be in their menu. Plus I do have a lot of garden snakes around the house as well.

Good to know she opened her own online store. I have ordered a few trees from her before -- the last one being a variegated guava tree that produces delicious fruits and are worm free. I talked to her a few years ago 'cause she mailed me a tree that according to the invoice inside de the box was destined to someone else -- she told me that I could keep the tree, but since the recipient was only a few miles from my home, I delivered the tree for her.

42° as well in central-west Broward - no visible damage on any of my fruit trees or any of the other tropical plants     One thing to take into consideration is that the temperature only dropped to 42° for a couple of hours and when the sun was pretty much already out.

To add: Pineapples, Guavas, Acerola, Pitanga

I agree with Pineapples and I have never grown Pitanga, but where I'm from acerolas and guavas are not known as short-lived or near short-lived fruiting plants. My grandfather had an Acerola (known as cereza in Cuba) tree in his home's backyard located on the eastern part of Cuba, which he planted back in the 50s. The tree was huge, provided a very nice shade, nectar to the hummers and lots of fruits year-round - when I left the island back in 1996, the tree was still producing tasting cerezas, so do the math. In the same backyard there were two enormous guava trees that you had to shake in order to get the guavas down that were also over 30-years of age.

Acerola
The fruits can be harvested after 3 years of planting, though, plants attain its peak bearing stage in 7-8 years of planting. Productivity increases up to 15 to 20 years and then stabilizes or declines but the plants can yield up to 40 years.

Guava
The plants start bearing at an early age of 2-3 years but they attain full bearing capacity at the age of 8-10 years. Fruit production starts to decline after 15 years, but like acerolas plants can yield up to 40 years.

38F in the early morning hours here.
No blooms yet so I guess thats good

Do you have your own thermometer or you just looked at your iphone? I'm in Weston and the lowest I saw in my own thermometer this morning was 42°F at around 7:00AM. So, the 39°F that the Weather Channel was predicting was off by 3°F or perhaps the canal next to my house helped a little bit. By 8:00AM the thermometer was at 45°F and by 9:00AM it was at 47°F.

Actually, Coral Springs can be a degree or two cooler than Weston - interesting 

Define "never".  A 50% chance in a given winner?  A 1% chance?  A 0,01% chance?  A 0,0000000001% chance?

According to this map, the highest zone in the continental US (if you'd call them "continental") is Catalina and San Clemente islands, just off the coast of LA.  Zone 11a.  After that comes 10b: Coastal Los Angeles, the area just north of Yuma, and - although it's not really clear - maybe the Florida Keys (again, though, are coastal islands "continental"?  Your call!    )

Fake News!

According to the same exact map [just use the interactive one: http://planthardiness.ars.usda.gov/phzmweb/interactivemap.aspx]
The highest Zone is none of those islands mentioned, the highest Zone in the continental U.S. is Key West (Zone 11b)
Miami Beach is in Zone 11a and most of Miami Dade county and part of Broward and Palm Beach county are in Zone 10b. It's also worth to mention that a lot of fruit and tropical trees need high humidity (A.K.A. Florida's climate)

The SE tip of Florida (excluding Miami Beach & the Keys) have seen freezing temps, but it's sooo sooo sooo rare and so fast that many tropicals have recovered from the damages.

If you're looking for a safe haven to plant tropical trees in the continental U.S., that has never seen a freeze, then Key West is the indisputable winner.

FYI: The lowest recorded temperature in Key West is 41 degrees on Jan. 13, 1981.

"Does it contain more Vitamin C than camu camu (myrciaria dubia)?"

Of course not, myrciaria dubia contains up to 3000mg of vitamin C for every 100g of fruit. However, myrciaria dubia is no match to a green, unripe acerola cherry, which packs up to 4000mg of vitamin C for every 100g.

Sounds like a great trip, but why not on a weekend? Some of us have to work to save money to buy fruit trees 

Mine started fruiting right before two years in the ground. What has been consistent with this tree is that it doesn't fruit during South Florida's summer heat if planted in full sun - it blooms but doesn't set fruits or the fruits come out misshaped or never reach maturity. Mine is blooming right now and I already see the pollinators hovering around (some sort of large bees. )  The inset picture was taking in October last year, so I'm expecting to start eating these delicious cherries soon. The season should last until May-June next year.

As a side note, my tree is located on the east side of the house, which was the side that received the most damage from hurricane Irma, but luckily this tree was intact - not a single broken branch. I'll post a picture later.

Thanks Future!