Where's best to take flesh from a person?

The 8th level spell Clone requires a1in^3 block of flesh. Where do you think is the best place to take it from, in terms of pain, recovery and physical interferrence?

You don't want to sever anything, as you would need a regenerate spell to restore that. Taking it from too close to an artery or major vein would be a problem.

A person would have to be fairly fat to get that removed from something like a shoulder. It seems to me like arm or leg muscle is the most viable place.