The PetCo on 100th & Bridgeport has a nice open tank set up just for plants, and they threw some goldfish & koi in it just for the heck of it. They don't have a huge selection, but once in a while they get a very nice Anubias in. If you don't mind potted/tubed type, the PetSmart in the Lakewood Towne Center has a few there too. But nothing like the PetCo.