The rusty red millipede, T. corallinus, pantropical and introduced across most of the warm world including Florida.
Small, around three inches, reddish, and among the easiest millipedes to breed. Cultures produce continuously with minimal input, which makes it a common cleanup crew species as well as a display animal.
Prices are at the floor and structurally cannot rise, because anyone with a culture generates surplus faster than they can use it. This is the millipede equivalent of Porcellio laevis: not the one you keep for prestige, the one you keep because it works and costs nothing. If a vendor is charging a real price for these, look at another vendor.
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## Isopods