Well, not guaranteed new and not super cheap, but I still scored a good deal. Got myself a brand new copy of Makai Kingdom for $38 this way ($12 off of retail)

A) Sign up for a 10 day trial of Gamefly (gamefly.com)
B) Rent some just released games you want
C) If they're new releases, chances are you're the first (or very close to first) person to handle them. My copy of Makai Kingdom was untouched.
D) Go to their website and opt to "Keep it". They'll ship you out the manual and case for free.

So yeah, $38 and free shipping for a game that sells for $50. I can deal with that