I found a website that requires you buy with min 15 yard orders, but it might be good for your background fabrics. I think we need something like 16 yards. I just ordered my background (although I already have 6 yards) but it was only $2.40 a yard, so I figured I would use it on other projects. It's a neutral, so not a big deal! I got an entire bolt, shipping included for $37! So, check it out if you are looking for a large quantity!
http://www.fabric4less.com/index.php?main_page