Just noticed some Irwin 9SP 9" locking C clamps (two per package
for $20 US) at the local mega hardware store, and grabbed them.
They have smaller Vise Grip handles and lighter duty clamp jaws
than the standard heavy-duty locking C clamp at the same store,
but the reach is 1 5/8" longer. Not massive clamping power, but
they work great as expected.

What do you use for a deep grip clamp?