I've ordered stuff from Performance before. What do you mean they don't ship down here? When I ordered stuff from them, they even sent it via USPS so it came straight to my door, no hassles.

Anyway, torque wrenches aren't unobtainium, and I wouldn't be too concerned with buying a bike brand pre se. If you look around, you'll probably find a non-bikey one cheaper anyway. (just like you will for fork oil, greases, other tools etc.)