I just found this site that has the Wall Pops for half price. They also have free shipping for orders of $24 or more.
http://www.houseoftatouage.com/wallpops_
(This comes to the same price you would pay at signwarehouse.com with shipping - when you figure pricing per inch) You just don't need to buy so much at a time to get the price. There are fewer color choices though.