Official parts for the Tx2:

http://partsurfer.hp.com/Search.aspx?type=PROD&SearchText=FR171AV

Moderator - Creator of Tx2 Touchsmart All in one Installer.
Touchsmart Tx2z Laptop: AMD ZM-87 CPU, 4gb Corsair DDR2 2x2gb, 256gb Corsair Performance SSD, Windows 7 Ultimate Signature Edition.

I was asked to change the wording of my post so here we go.

but be warned, hp is known for: preforming a statutory offense
on people with their prices.

<br> For Sale <br>
Tx2z-1300 // ZM-87 2.4ghz // 8gb // 1.5tb 7200 rpm// FP + Webcam // N + Blue tooth // 7 Pro//

Also keep in mind that while HP Partsurfer can find you all the parts and part numbers, that doesn't mean you have to order from them, there are plenty of other distributors that can get you HP parts as long as you have a part number, that's one of the reasons you will not find them listing things at a low price, they need to ensure their business partners can sell at a decent profit margin.

Diane