I was on Slickdeals.net this weekend, and came across this offer.  Basically, through 7/28, if you have never signed up for Amazon Prime before, you can use this link to get $10 off your next Amazon order when you sign up for a free one month trial of Amazon Prime.  Amazon Prime allows for unlimited two-day free shipping and no minimum order size. This is a good deal because you can use your $10 credit and still get free shipping (usually you need $25 to qualify for free super-saver shipping).  Cancelling Amazon Prime before the free month is up...

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