I have made several quilts using plaid shirts from our local thrift stores. I purchased only 100% cotton shirts in the largest size I could find and my limit per shirt was 99 cents. This thrift store marks merchandise down each week so if I saw one I really liked I would wait a week for the mark-down day but still spent no more than $1.99. It's amazing how much usable fabric can be found in an XL shirt. I don't think I spent more than $20 in total and with that was able to make 1 king, 1 queen and 2 60" X 72" ones before passing on a big bag of 5"squares to a friend. Thinking of doing another. Have fun making yours.