Low profile CNC clamp kit for 1/4 20 T slot tracks $30 shipped in the US. The provided hardware will get you up to 3/4" materials. These clamps can also be used with your own hardware for an X-carve stock M5 waste board. If you would like just clamps and carriage bolts to use your own hardware it will be $25
Kit includes:
(4) Pastic Clamps
(4) Plastic Nut knobs
(4) Washers
(4) 1/4 20 1.5" bolts
(4) 1/4 20 nuts
(4) 1/4 20 1.5" carriage bolts