Yesterday I ordered my 15" through the online Apple Store, and it came to $2,589.00 (Canadian) without the tax. I got cold feet and wanted to try it out at the actual store, see the 15" vs. the 17", etc. I finally decided I wanted the 15", and am filling out the order this morning; it now comes to $2,607.00. Can anyone explain this? Both times I've done the exact same upgrades: to 2.3 ghz, to 8 GB ram, and to high-res antiglare screen. I guess one of these has gone up in price. I think it might be the RAM. Can anyone explain/answer this? How can they justify making something more expensive overnight?