These drafting tools were at the Goodwill, at two separate times. Since this particular store sells clothing and "housewares" by the pound, they each cost me about two dollars. They earned their keep on my last quilt, helping me get those long cuts straight. So, in a way, they've been repurposed, and recycled, and will definitely get used again and again.
Check out this link to a neat idea! It looks like a lot of fun, especially if you can get a bunch of T-shirts and cut them all at once. Even more fun if you have a kitty in the house to play along with the yarn balls :)