There is a nursery in Leesburg on a street kind of parallel to the main drag. I think this is it, though the name doesn't ring a bell:
Central Florida Gardener: Simon Seed Farm & Garden Center I bought tomato plants there one year and grew them in the fall. I used a raised planter they sold and the soil they recommended. I agree that Florida tomatoes lack the je-ne-sais-quoi of those in the north.