Get a FREE $10 Credit on Google Wallet for Nexus 7, Galaxy Nexus, Galaxy S3 (Sprint) and More Smart Devices. Google offers a free $10 credit when you set up one of those prepaid Wallet cards on any Android device. The Nexus 7 is included in that list - and the $10 credit is available there even if you've set up Wallet on your phone and gotten a $10 credit before.
• Open up the Wallet app on your Nexus 7 (it's preloaded on the tablet; just look for the Wallet icon in your app drawer).
• Follow the instructions to link the app to your Google account and set up a PIN. It may take a minute or two for the service to initialize.
• Once you're at the main Wallet screen, tap "Payment Cards" and select the option to add a Google prepaid card.
Google Wallet Prepaid Card
That's it! The app should now show $10 on your Nexus 7's Google Wallet prepaid card; you can use the money by tapping your tablet on the checkout terminal at any business that supports NFC payments. You have to however spend the money by the end of October.