Texastam, here are a couple of paper packs, but there are many kinds and brands available. This is just to point you to a couple possibilities. If you read through this thread, you'll find very affordable alternatives mentioned.
http://www.joann.com/that-patchwork-place-blank-foundation-papers-8-1-2inx11in-100-pkg/1072255.html#q=foundation+paper&start=2
http://www.joann.com/carol-doak-s-fo...+paper&start=3