Just walk in and explain that after spending over 1200 on this computer you don't want one with a deal pixel. Be nice, calm and polite and I'm sure they'll agree. If they laugh at you, talk to their Manager (still politely). Tell them that you are still within the 14 day no excuses for exchange and they can't hit you with the restocking fee since you are exchanging NOT returning.
By defintion of the Apple limited One year warranty:
WARRANTY COVERAGE
Apple's warranty obligations are limited to the terms set forth below: Apple Computer, Inc. ("Apple") warrants this hardware product against defects in materials and workmanship for a period of ONE (1) YEAR from the date of original retail purchase. If a defect exists, at its option Apple will (1) repair the product at no charge, using new or refurbished replacement parts, (2) exchange the product with a product that is new or which has been manufactured from new or serviceable used parts and is at least functionally equivalent to the original product, or (3) refund the purchase price of the product. A replacement product/part assumes the remaining warranty of the original product or ninety (90) days from the date of replacement or repair, whichever provides longer coverage for you. When a product or part is exchanged, any replacement item becomes your property and the replaced item becomes Apple's property. When a refund is given, your product becomes Apple's property.
It's IN the warranty with the purchase being only 14 days in...they have to do it, laughing or not. If not, tell them politely that they are going against the Apple warranty and you WILL call the Better Business Bureau.