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Are you a student? If you are, I suggest just buying it through Apple. If you use ebay, buy a boxed copy only. I do not recommend just buying a code due to the amount of people recently experiencing problems with verifying their codes to Apple's satisfaction. Amazon and other retailers can often beat Apple's price for non-students.
 
Where has everyone purchased Applecare for their 15 inch macbook pros

Where are you from? If you live in UK and bought your mac with Higher Education discount, you might already have a custom warranty (VERY similar to apple care) without knowing about it...

Fabian
 
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