It looks like they've got a buy 2 get 1 of equal or lesser value free for a lot of things.
3 for 2 video game page
I called Best Buy at their number (1-888-237-8289). They said they can charge you and then you can pick up in store. I didn't ask on item limitations and they couldn't give me an answer on whether or not it would be in store. I would assume its online only, but typically they won't charge you for an in store pick up.
EDIT - clarification, they won't charge shipping for in store pick up.
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