Here is some vinyl on sale for this week only

http://www.dennymfg.com/specials.html#net070222

I think you'd be surprised at how durable the seamless paper is though, I have yet to get a hole in it and my dog has pounced all over it playing with her toys. It does crease though.

Here are some canvas backdrops on rollers that won't wrinkle.

http://www.backdropoutlet.com/catalog/product_info.php?cPath=21_23_29&products_id=297