I've put several veterans that I think could have value to other teams up on the trading block. Most of them have bonus-heavy contracts with 2 or 3 more years left, which means you'll be acquiring good players with low cap hits while I eat a bunch of dead cap. So make some offers!
Also, just because a player isn't officially on the block doesn't mean he's off limits. Feel free to reach out to inquire about any player on the Houston roster.