yeah OEM is going to be a lot more. I bought this for the Qi charging:

http://www.amazon.com/gp/product/B00MWS5L34/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

for that money you could buy a case and you'd never know your back was scratched plus it'd be better protected

You replace the NFC chip when you install this one

http://www.amazon.com/gp/product/B00MWS5L34/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

and it works the same as the stock one