Remember last year when Amazon introduced its price check app?

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Amazon also introduced its online storage service Cloud Drive last year.

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Consumers "see this as a real convenient way to redeem their cash-back bonus, " says Dana Traci, vice president of rewards at Discover, which introduced its Amazon offering last October.

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Amazon first introduced the public at large to the concept of IaaS in 2006, when the company launched its Elastic Compute Cloud (EC2).

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