Is there a price comparison extension which works flawlessly in India?
I am really satisfied with ValueTag Application Really awesome experience
I would highly recommend ValueTag. Its one of its kind with international style and working
Check out http://valuetagapp.com/in/valuetag_ext.php
They also have an android application which shows best prices right there on your phone https://play.google.com/store/apps/details?id=com.copperpix.valuetag
One best thing i found is they have barcode scanner which can tell u prices by just scanning the barcode.
Try BuyHatke! from http://compare.buyhatke.com/extension.php
Also checkout PriceWink at http://www.pricewink.in