I agree that $13 seems like a lot to pay for a bag pattern. I would consider how useful that bag will be to me and how unique it is. I would wonder if I could reverse-engineer a pattern from the photo. But if I really want it, and it won't wreck my budget and I am willing to forego something else I could buy with $13, I would purchase it. Sometimes, if I wait awhile, I often forget that I wanted something. Or, I might realize that I really want it in spite of its high price. Maybe a friend also likes it and might be willing to split the cost and share the pattern with you. Depending on the construction materials you use, $13 is a low price for a bag you will use often and enjoy a long time. Good luck!