Unless you have 6th Avenue stores locally, don't be surprised if they refuse to do it. After all, their policy is to beat the price of local stores. However, I didn't have any problem with Best Buy matching an online price for my Pioneer 1015 four years ago, and it wasn't from a local store. This past summer, though, they refused to match the price from Amazon on a TV.
I've read that it's more effective to ask for a price match over the phone (because the store knows that you're more likely to go somewhere else if you just need to hang up versus walk out of the store). I got the price match on the receiver over the phone, and was rejected on the TV in person. Doesn't mean that there weren't other reasons, but I'd say give them a call first and see what they say.