I've found cool things in gift shops, especially tourist gift emporiums. And also the gift shop in the big aquarium downtown (kid's section) and museum gift shops. From these places I have a rotating stock of resin beach chairs, Parrot reading a book in a hammock, alligators, a tiny TV (love it, fish swims up to check it out and I say "Don't sit so close to the TV, you'll ruin your eyes").
Places online that sell dollhouse miniatures are a great resource. Many resin things in varying sizes - you could make a 3-story home for fish, completely furnished like a human's.