I got my first "sweet tamarind" from treehouse nursery in Pine Island few years back just over a foot long. It is now 8-9 feet and had flowered a few times with now fruit set, maybe one or two but did not get big enough and fell off. This year, the tree has a few pods probably less than 10 but they are getting bigger than the last. I still have to see if this is a sweet kind, but I doubt it. The pods are short, my clue that this is not a sweet variety but it is too early to say, hope the pods get monger as the tree matures.
I got another tree also labeled sweet at ECHO nursery in Fort Myers, it is less than 4 foot tall and is already flowering, no fruit yet. The two trees are in different houses, many miles apart.
There was come one from Vietnam, I think, selling sweet tamarind seeds on eBay. I almost bought some but I thought, I would wait until I get some fruits from these trees.
I know someone here in Port Charlotte that has an older tree that he maintains low, 10-12 feet, that is reliably fruiting. He claims that it is sweet but I haven't tried it.
Tamarind does well in my area.