For Mangos Alex at Tropical Acres in West Palm
General purpose nurseries, Pine Island, Als' fruit trees, Lara Farms, Richard Lyon's in the Redlands
Dustin at D's in Cutler Bay is expensive but has top notch stock are rare stuff. Plants are in most excellent condition, the total opposite of Excalibur.
TREES N' MORE near Palm City was a pleasant surprise. Nice selection of healthy trees at very reasonable prices.
Spyke's Grove in Davie sometimes is worth a look.
Those are about my main sources.