In most of Florida, only the Blue tilapia are legal without an aquaculture permit/license whatever. I know Miami Aquaculture has sold some of the Rocky Mountain Whites to some forum members but those members lived in PA where there isn't much chance of the fish escaping and becoming naturalized the way the Blue Tilapia already have here in Florida (which is why they have given up and allow people to keep the blues.)
Anyway, down there around Miami, you can easily support tilapia year round only needing to worry about protecting them from cold during the rare frost/freeze advisories you might get.
If anyone does sell and ship you anything but Blue Tilapia they should be clobbered. South Florida is horribly overrun by "escaped exotic pets" and it is rather amazing how well tilapia fry can travel. (as in a simple system overflow during a heavy rain event could easily infect the wild with more of them, this is how the blues escaped back in the 70's.)
Sorry, enough of the public service announcement.
So, if you want a mixed gender population of blues to get you going, Morning star fishermen can sell them to you. They charge a fair bit for the big ones that are sexed but if you just want a general starter population, they will sell small fish pretty cheap. Only drawback is they are not equipped to ship. You will have to drive there with a suitable container and battery powered aerator or inverter and aerator to get them home.
Then again, I know plenty of people who have started their Florida AP systems by netting tilapia out of canals.
Good Luck
p.s. by the way, most of those places that only want to sell the all male fish, well it isn't that they are hoarding or keeping the females to themselves (though the few breeders they have they probably wouldn't part with easily) it's that they feed all the fry on hormone laced feed to make them all develop as males since all the fish farms growing out tilapia commercially only want the males. All male populations of tilapia grow much faster and bigger, as soon as you throw a few females in, and they get into breeding, suddenly not as much energy goes into eating and growing and the farms production is in the can. So it isn't that they wouldn't sell you a mixed batch, they just are not set up to have mixed gender populations because their normal customers don't want that.
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