Saw these clamps on clearance sale at Timbecon. They would seem to be exceptional value. Although they're probably more appropriate to the metal work community I would expect that there are members here who would use them. To give you an idea of value Total Tools sell the 200 x 100 size for $69.95 compared to the $25 that Timbecon have them available for. :o
https://www.timbecon.com.au/torquata...RoCZpAQAvD_BwE