Are you running aftermarket, multi-fit steel rims? If so, I'd first check to make sure the rims are centred properly on the lugs. If the tech was careless in mounting them, then you could certainly get some vibration even if the tires were properly balanced.
If multi-fit rims aren't the problem, I'd probably go back and ask them to balance the tires again (at no extra charge).
If that doesn't take care of it, and there's no obvious damage to the wheels or tires that would prevent a decent balance, then finding another shop with a Road Force balancer is probably the way to go.