I was automatically signed up for Prime when I registered my Kindle and I guess the faster shipping is working against me as some of my purchases have gone down in price and there's no way to cancel and reorder. What's the link for the Amazon pricematch request if Best Buy sells it cheaper and if Amazon lowers some of its prices before it ships, can you call them up? Being its Thanksgiving, do they have people picking up phone calls or do they have that outsourced like I remember.
I have Prime too, just ordered late enough yesterday that it hadn't shipped yet.
You can e-mail CS and ask about price matches. I know when it comes to them adjusting when their price drops it's a crap shoot. Sometimes they'll do it, other times they won't (policy is to not--they don't have a 30 day low price guarantee or anything like that).
I'm not sure what their policy is on matching other retailers. My inkling is that they usually don't do it since they're are usually threads here and in the game deals forum with people saying they hope Amazon drops their price to match--if they had a consistent price matching policy that would be a moot point.