I've made and sold 3 t-shirt quilts so far and will be making one for my school's band to sell at auction next month. When I was first approached about making a t-shirt quilt I googled several websites and looked at what they charge vs what you get. A cheap t-shirt quilt involves cutting out 12.5" squares of each shirt regardless of the design size and stitching these blocks together for a quilt. Most of these quilts sold for around $13-$14 per shirt. Since I add sashing and do quite a bit more for my quilts I charge $16 per shirt. An average quilt takes 20 shirts and I charge $320 for the quilt. I also make a pillow case in coordinating fabric to either use along with the quilt, or use it as a bag to store the quilt.