I've actually had A. opacum... Its legal here to have up to 3 in your possession. As for A. annae, I know they're in the hobby. As I understand it Sandfire Dragon Ranch used to sell quite a few but it doesn't look like they carry them any longer. They may pop up occasionally. I'm pretty sure T. rivularis is never seen unless it gets confused with T.granulosa, but John would know more about that. I'm pretty sure Centrolene doesn't come in though. There may be other species of "true" glass frogs (not Hyla) that come in. Which book did you get, the one on Costa Rica?

Alex