places like hobbylobby and such generally have a wide variety of decorative fakery. I know they have just about every fake flower imaginable, but I bet the also sell faux wood or even real driftwood for vase arrangements.

Haven't ever actually gone looking, though. But it might be a good place to start.

I actually bought a live tropical plant from petco for only 3 bucks...It's nice and healthy and I adore it. Not good for climbing, though. He mostly knocks it over.