Link to the pen under shopping.hp.com, $19.99

http://www.shopping.hp.com/product/computer/categories/specialty_products/1/a...

Cannot link directly to the hp parts supply website, but yes, I do see its price as $80.75, part number 516454-001.

Not sure why the price difference, but it happens alot with HP since the two stores are not linked.

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've heard rumors of a pen that had an "eraser" function. Maybe the more expensive one is that one?

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Not sure if it is rumor or not. Read about it on these forums somewhere.

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The rumour IS a FACT. Dell xt tablet pen has an eraser and works with the tx2 and I USE ONE. It has two buttons and the smallest button works as an eraser. I think its the closest thing to wacom's permanent eraser.

Well when I just checked the HP store is listing 2 different pens.

A tx2000z eraser pen for $40: http://www.shopping.hp.com/product/computer/categories/specialty_products/1/a...

And a tx2 pen for $24: http://www.shopping.hp.com/product/computer/categories/specialty_products/1/a...

I have no kind words to explain the difference in price between buying an extra pen from the HP store and buying a "replacement" pen from the parts store. But basically HP sells computers, not parts and this is going to be very obvious if you ever need to order parts. The only other thing I can add is the prices for a few other replacement parts I looked up out of curiosity..

Display assembly - $704.90
Motherboard (no cpu, ram, or fan) - $376.20
Top plastic cover w/ touchpad - $75.05
Screws - $49.40
Rubber screw covers for the display - $49.40
Rubber feet - $42.75

Total for roughly 40% of the laptop in parts - $1378.45
Cost for a new one - About $800

Prototype is right, tx2000 series uses wacom digitizer and tx2 uses N-trig digitizer. N-trig is a cheaper alternative to wacom so hence the heaper pen price. For those who want to know the Dell pen im using for my tx2, here is the direct link http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=220446886689