One important restriction on mailing is that you CANNOT mail fertile ants through USPS. Which means that all of those ant farms you see being sold to kids? You pay money, and get some sterile workers who are guaranteed to die pretty fast, leaving an unhappy kid. If you want a real ant farm, you need to either collect ants locally, or buy ants in person from someone who did themselves. And you'd better known the rules…
Actually there are two species that were made legal to ship in the US last year. More information (and for sale) here. [0] [0] https://tarheelants.com/pages/ant-queen-and-colony-adoption
I wish they were legal a decade ago when we were trying to figure out how to buy ant farms...