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Crystal Shopper

Install below, then while shopping, simply tap your Glass, say "OK Glass", then "price check": OK Glass menu price check voice command
Line the bar code on a product up in the box of your display to scan it. Scan close up, under bright light, and placing the product on something to keep it steady if needed. Scanning
Crystal Shopper will automatically look up scanned products and provide prices and reviews from a broad catalog of online retailers. Results
You can also use the "shop for..." voice trigger with a spoken request after to shop by voice: Shop for voice trigger
Swipe through results and tap to access menu options like emailing yourself a link or browsing the source merchant web site. Email menu item Browse menu item Browsing