Most of Exoticas inventory like others have said was bought out the last 5 years. I was down there a little over a month ago, and the only thing I thought was an ok price was a macadamia nut rooted cutting in a 5 gal I got for $70.
I bought a Diamond guava seedling about 4 years back, after tasting one of the mature Diamond guava seedlings on a past visit. The trees were gone which I tasted the fruit from, so I had to asked Steve if he had anymore. He did have some smaller 1 gal seedlings of Diamond guava, so I took a chance and grew it out. The tree fruited last year and the guava was very large with great flavor and a small central seed cavity (so I would say I got fairly lucky with the offspring). The other guava seedling which I got he called it waimea red guava. This fruited last year as well, however the fruit was not red and the flavor was ok. I would rate this guava like a B-, its a dwarf stature with good production and decent flavor so I will keep it for now. The Diamond guava seedling I would rate as a solid A.
I would not recommend going there unless you want grafted mango or a common grafted annona (gefner etc.). Everything else is mostly seedlings with variable quality, the loquat seedling may be worth it depending what mother tree they are from. The guava seedlings are a random chance you probably get a decent tree at least. You are going to get better selection of trees with ad hoc local collectors, etsy/ebay sellers, and online nurseries. The tropical fruit scene is booming in South Florida with small fruit farms and nurseries. California it seems to have stagnated with nurseries.