I've mostly-bought, sight unseen ... basically negotiate the entire deal, make it clear that if my inspection & drive agree with the seller's description, I'll pay such and such a price -- and also that if anything is obviously not so, or if the seller tries a different price, I'll walk immediately.
I've done this often since '90 when I first did it, didn't want to drive 80mi just to haggle with a salesdroid and find out we weren't compatible.
Last time, we flew to Vancouver BC (from CA USA) and bought a car for tons less than local (and way fewer miles... er, km), even with import fees. Worked out great.