The quilt in my avatar was made completely from my stash. I did buy a variegated thread to quilt it with, so the total was less than $5! :D
I try not to spend too much on any project, but this post has encouraged me to keep better track of what I'm spending. All the "little" things can really add up! I may start keeping a notebook with my projects, and keep a running tally of anything I spend on it, even if it's 50 cents!