http://www.amazon.com/Irwin-Industri...5132775&sr=1-1

I think this will take you to the type of clamp that I use. The version I use is on the small side and they can be bought for less than $10 I am pretty sure. Off brand of course. One hand operation both clamping and unclamping. It is a real handy tool for lots of things and worth having in the tool box. The clamping surfaces are soft rubber like material so they won't scratch anthing. The C clamp above will work too but you need to be careful about scratches.