4gb (2gb X2) Memory ram sticks for new imacs

I just bought a new iMac specified here --> http://store.apple.com/1-800-MY-APPLE/WebObjects/AppleStore.woa/wa/RSLID?nplm=FA877LL/A

but I am trying to upgrade it myself to 4gb. Does anyone have 2 of 2gb sticks and what price they are willing to sell ? or whats the best and cheapest site to buy ram from

 

That said it was the notebook model though ?

 

what about this one ? -->http://www.newegg.com/Product/Product.aspx?Item=N82E16820145184

do you think it will work for it ?