I'm not sure of the legal issues, but is going to PR considered crossing an internatinal border? It is part of the US (not a state, but a...I forget the term). You may be able to bring (or at least ship) them back. They're available in the hobby fairly regularly, so there may not be a problem. I'd check on the rules first, of course, but it may be worth it
Be sure to make it clear that you're not bringing back plant eating insects. These are stickly regulated. Generally, predators such as centipedes, tarantulas and scorpions should be OK.
You should alos be clear that they're for your personal use and not going to be sold. If they think you're a dealer, then they may consider them merchandise which could have other ramifications as far as customs is concerned.
U.S. Territory, yup, that's the word I was looking for. Thanks!