Summary: Ordered my first Mac on 8/26 and should get it by tomorrow (9/2). I used Mac Mall, which took a little longer than other retailers, but saved me about $230 in price, taxes, and rebates. 13" rMBP 2.9/8GB/512GB.
This frugal Mac newbie can't wait!
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Long version below:
Back ordered my first Mac last week on Wednesday (8/26) through Mac Mall. Wasn't sure what to expect from this retailer. The prices were the same as Apple.com with the education discount (which I don't technically qualify for), except that I wouldn't have to pay sales tax (5.3% here) and I could get a 2% Ebates rebate. The Mac Mall site said "out of stock, usually ships in 4-5 days (8/31)." Got a call from them on Friday telling me they would ship it out on the 4th (8 business days). I call them back wanting to cancel the order so I can get it through B&H (same price, no 2% Ebate), but this time they said it would ship out on 8/31 (Monday, 4 business days). Fine, I kept the order, but I called them Monday to check the status and they pushed back the shipping date to 9/8 (10 business days) but there was still a chance it would ship out that same Monday (4 business days). Confusing, right?
I finally got an email late last night (8/31) that it had shipped and should arrive tomorrow 9/2.
Okay, so bottom line, it took about the same time they said it would take to ship (4-5 days), but the anxiety of not knowing when it would actually happen, and constantly getting conflicting shipping estimates, was a bit exhausting. In the end, it was probably worth the $230 discount. But I know other folks wouldn't want to put themselves through that! If you want to save money and don't mind waiting a bit more, go with the back order. Otherwise, just go with whoever has the lowest in-stock price.
Additionally, most folks would just get it through Apple and have piece of mind wrt returns. Call me cheap, I guess!