That Taobao link above is good start. Taobao is incredible. That said, if you're not set up with local bank account and mailing address one can find them in an

That Taobao link above is good start. Taobao is incredible. That said, if you're not set up with local bank account and mailing address one can find them in any electronics market. SEG Plaza in Shenzhen or Modern Electronic City in Shanghai should have them for 20 kuai. They usually come with an ultraviolet led for currency fraud detection - there are so many small stores and so many people in China that these are basically ubiquitous. There is a trickle down effect on Amazon too: http://www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias%3Daps&field-keywords=phone%20microscope&sprefix=phone+microsc%2Caps&rh=i%3Aaps%2Ck%3Aphone%20microscope http://www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias%3D... - see for instance the one available for $3.96 - I would splurge and get the square boxy one though.