Buying a new MBP from ebay - screen upgrade

[JavaWizKid]

I'm going to upgrade my 2 year old MacBook Pro for the MacBook Pro 15" i7 model with the glossy standard screen. However, I looked in the Apple store today and decided I can't stand glossy. I want to get a high resolution matte one. If I buy the glossy MBP from eBay can I bring it to the Apple store or a reseller and ask for a screen upgrade and pay the price obviously and not void my warranty? It works out cheaper rather than buying it through apple built in because Apple charge excessive in the UK.

 

[noodle654]

There are no mattes/HR on eBay?

 

[JavaWizKid]

Can't find one, anyway if I attach it myself it would void my warranty though + I don't fancy it haha!