Appbounty:Gives you Itunes,amazon,and other giftcards by downloading apps refferal code:eawuitc Appjoy/appnana: Gives you all kinds of giftcards like paypal, itunes,amazon,and others by wathcing videos, downloading apps, or doing offers. Invitation code: I562807 Feauture points: Rewards you with apps and giftcards aswell as devices like IPad Mini. Just by downloading apps. Refferal Code:8FVQ96 Tapbooty:Gives you amazon,paypal,starbucks,and facebook giftcard. By downloading apps. Refferal Link: http://www.tapbooty.com/r/WNKm9rZ/ Parrotpoints:Download apps to earn giftcards Refferal code: O76955 AppWinnings: Download apps to get amazon or itunes gift cards Refferal code: 2fcc96 AB Browser/appbrats (on appstore): Gives you paypal giftcards (probaly will add some more in the future) By downloading apps Refferal code: E4V5J6 Oh Gosh! (download on the appstore): Get giftcards by doing offers or downloading apps (not sure) Invite code:VJY5619 AppInviter:Lets you get amazon giftcards by downloading apps. Invite Code: 2g56
I know a few more however I think this should be enough. :)
The best place to get Amazon gift cards for free is through a site called instaGC. You do easy tasks for points (the points add up quickly) and then cash the points out for a gift card. Click on the link below to try the site today.
I have yet to find a really good app for earning free amazon gift cards but I have had luck with this site http://www.instagc.com/amazon.com/37236 for earning amazon gift cards at no cost to me and the codes are instant once you have earned enough points for your reward.
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Tremor Games allows you to earn free Tremor Coins to redeem free Steam Games, Steam Wallet, Steam trading cards, DLCs, Orgin games, PSN or Xbox live credit, Amazon gift cards, desura games, GOG games, in-game credits, Bitcoins etc...