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Keepa - Price history charts and the option to be alerted on price drops for all Amazon sites.
QuickMark - QuickMark makes everything possible.
PriceGrabber - Get the lowest prices on computers, electronics, furniture, cameras, clothes and more.
ZXing - Barcode Scanner for Android
Shopping.com - Shopping.com is a leading price comparison site that allows you shop online for the best deals and lowest prices. You can read unbiased product reviews and compare prices online. Online shopping has never been as easy!
Barcode & QR Code Scanner - A free app which allow to read and generate barcodes for Android.