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Amazon is making rivals like Walmart sweat a bit more over the holidays by offering free shipping with no minimum purchase to everyone. The company announced that it's waiving the usual $25 minimum fee required for non-Prime customers in a US-only promotion -- the first time it's done that, according to Reuters. The deal is effective starting today and will last until just before Christmas when Amazon can no longer promise free delivery in time for Christmas. Amazon notes that it has the largest selection in the US of products available for free shipping, with "hundreds of millions" of items. To make sure it doesn't miff Prime clients who pay $120 for the same privilege, Amazon also seems to be extending free same day delivery to those folks on "over 3 million items," it said, on top of the regular two day free shipping (Engadget has reached out to confirm that). While over half of all US households have a Prime subscription (think about that for a