In our area (Michigan), the blue Irwin clamps can be found at Lowe’s. The similar yellow clamps found at Home Depot (sorry, I don’t remember the name) are not as good. We use the 12″ clamps which are about $15 a pair. I have used the smaller clamps as cone holders in the center cross bars of the warping mill to leave yarns in wait (although they may make the mill go alignment when warping at warp speed 😉 ). These clamps are invaluable. I own a shop and they are used as rigid heddle pegs and to clamp the loom to the table, to hold raddles, to hold mills, to keep inkle looms from wandering while warping and other things. Worth every penny and then some!