Naughty, naughty!!! After reading this thread I just had to go online and order those clamps from Harbor Freight. My justification was that I wouldn't waste gasoline going to the hardware store and valuable time searching the store for these clamps. Some of these threads just tempt me beyond my ability to resist.......
Oh, and I didn't take a close look, but I think the set of clamps has them in various sizes. I need the ones that can handle a thick edge, so I went with the 99-centers (up to 1-1/2" bite capability). Shipping doubled that, but I figured I saved on gasoline.......