I wouldn't recomend changing just the touch sesor on the screen, it's attached to the LCD pretty damn well.
I can send you the contact I have in china where I found my replacement screen. $58
Here is the link for the screen that I bought
http://www.alibaba.com/manufacturer/...d028steb1.html
After I sent the money using moneybookers.com (seemed sketchy but i've not had any problems, no stolen money or ID) The brand new screen arrived within 5 days - Amazon.com can't get you spit as fast as this guy in China!!!
Kind Regards
J.