Once you figure out how many 2 1/2" X 42 inch strips you need, you will need to be carefull which jellyrolls you purchase. Reaon being, I boutht my strips from a website that offered 79 batik strips, all different for $32 and some change. It also offered free shipping on $50 or more. The website is www.connectingthreads.com. The strips were awesome!! They also have different sized jelly rolls, some with 20, some with 30 strips, etc. I have placed my 2nd order with them. Very nice website!!