I know there is some question about this, but I have done it and it works. Shopping through eBates you get a 25% rebate shopping at Sparks. They have Marriott gift certificates. Like I said, some say they don't get the rebate. I do. If you sign up and try it, please feel free to use my link for referral I would appreciate it.

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Earn money back for shopping online -- http://www.ebates.com/index.jhtml?referrer=keithnj973