I would never buy from Apple. They have restocking fees, charge tax and don't have any special deals on new items. Always go with amazon - they have great return policies, extremely fast and inexpensive shipping, great prices and don't charge sales tax. You can't beat that.
If you have a problem with your new 'book, and I hope you won't, you just return it to amazon and they'll send you another one as soon you email them the tracking number of your return. They'll pay for return shipping too. If you sign up for a free three month trial of their premier service, you'll pay 3.95 for next day shipping or free second day shipping. If they need to send you a replacement, they'll use the same shipping method you chose.
I love amazon and buy all my expensive technology from them. I've never been disappointed and always feel confident when I make a purchase from them.
Good luck!