In Portugal the EU law applies. You have the right to a 2 year warranty on any goods you purchase. It's no different with Apple products.
My rMBP had an issue with the screen two weeks ago (bought it in July '12) and the warranty applied with no problems at all. Since the display was not fixed but replaced, now I have another 2 years counting from today to use my warranty. Also, I bought it in one retailer and sent it for repair on an authorised Apple service centre and the warranty applied anyway so I guess you may buy wherever you want and then have it serviced at an Apple Store if needed.
Apple Care is a ripoff in EU countries since you already have a 2 year warranty by law. Of corse it offers more than another year.. I'm just mentioning that 1 year thingy in particular.