Just thought I would share the info.
I am fortunate enough to have a Grainger branch 30 minutes from my house, saves me the $10 shipping cost. 10 clamps for $23 beats the pants off of Super Atv's 4 clamps for $35.
[You must be registered and logged in to see this link.]In case links stops working Grainger item # 2UTG1
They also have galvanized steel ones even cheaper.