If it's an official Apple Retail Store, all standard models should be kept in stock. Build-to-order options are not available from the retail locations; they are simply ordered online just as if you were ordering from home.
No, you cannot change or upgrade the graphics card after purchase. In notebook systems like the iBook and PowerBook, it's not really a card so much as a dedicated part of the motherboard.
Online prices are the same as in-store prices.
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