I want to buy an MBP (13'' or 15''). There are some places (Amazon, MacMall, eBay,...) with better prices than Apple's site. In the AppleStore the prices are the same of Apple's site? Is there a chance to get some discount or promotion in AppleStore (NYC, as example)? If not, I think it is a better deal to buy in Amazon, MacMall, eBay,...right? Thanks!