Yea Best Buy will price match. You just need to go up to the customer service counter and ask about it. More than likely though they will call CompUSA to check to see if they have the game in stock. They won't price match if the game is not in stock at CompUSA.
It's worth a shot. You might also look at the buying the game from CompUSA's web site.
Long ago I used to work for CompUSSR. Trust me, you have very little danger of them getting through to somebody. I almost think their system is set up to discourage people from calling them. This may have changed, but thats how it was when I was there.
Just in case, bring their sale paper to BB. At least around here, if you have a current ad on-hand they wont bother to call and see if it's in stock.