Guru: Yeah its great! I have tried with a lot of people i know, no false matches! Gets dirty quite easily due to dirty fingers etc

but you just put a bit of sellotape over the glass, and rip it off, then its clean again! (Those are actually the official instructions!

)
Eamonn: Actually got it from ebay, after a large fiasco with amazon (Never ordering from them again!), ebay was bout ?40, amazon is about ?32
Ebay:
this is the guy i briought it from. but sure there are others
Amazon (UK):
here
Not sure if either ship to you though! Hope this helps
