I got them off of allpet.com. It was the cheapest I could find tall ones.
When using fakes just be sure to go for those made for aquarium use, and inspect them for anything potentially dangerous.
Go for some fast growing stem plants like anacharis, pennywort, hornwort, wisteria, etc. You can start with small inexpensive portions and they will grow fast. Otherwise you might end up like me and be bummed you ever spent so much on fake plants now that you can't stand them anymore.