I did something similar where you paid $10 and got a block kit. Then each month if you came in on the designated day to listen to what they had new in the shop or new products, you got another kit for a block. By the end of the year, you had 12 blocks big enough to make a twin quilt. If you did not come in on the designated day, you could still get the block kit, but had to pay $5 or $6. But we did know before hand what the final product would look like.