Amazon offers Prime members the Tekton Swivel Pad 6" Locking C-Clamp
, model no. 3816, for $6.98
with free shipping
. (Non-members can spend $25 or more to qualify for free shipping; otherwise, it adds $5.52.) That's the lowest total price we could find by $4. It features drop-forged steel jaws, a chrome-plated finish, self-levelling jaw pads, one-touch quick release, and should not be used for dental purposes.