I've seen them cheap on websites, but all the ones I saw had a $20 minimum order. A rude policy, since I needed nothing else. And all the images I found were warped or watermarked or somehow made to be difficult to copy. So I ripped the image off and photoshopped around their security. Then I just printed it, covered it with a piece of clear packing tape, cut it to fit and glued it in place with a little rubber cement. It looks perfect. If anybody would like to print a copy, I'll email the image to you.