2 for a twin sized quilt would be $60-80 depending on fabric. hrmmm... the designer fabrics might make it worth it as long as I was doing a strip-pieced quilt.
Have you been to Moda Bakeshop? They have lots of great ideas for the Moda pre-cut sets. I'm working on a rag rug with a honey bun - I bet you could use a jelly roll for something similar.
Re: XP: Jellyroll fabric bundles
1 jelly roll makes a 52" x 41", you need 2 to make a twin size quilt
That is what is on the label for one I got, I haven't actually used one yet.