I'm so happy I finally got calipers. I went to home depot, lowe's and OSH and nobody knew what the hell I was talking about. So until early this morning, I was going to build my own. I bought the 5/8 thick board to cut out the shape and then the screw and wingnut.
I kept digging though, and found this site -Clay Planet (http://shop.clay-planet.com/search.aspx?find=calipers) which is closest to home. Once I get there, there was a much better one laying right next to the generic ones and for only 25 bux. so stoked now.