This deal has ended.
Amazon is again doing a $10 off $49 promotion (via coupon code GROCERY3) in their new Grocery Store. They did this in August and the prices on almost everything were the best around. To give you an idea of how broad the selection is, I bought everything from Kellogg's cereal to Planters Peanuts to Green Tea to Tide to Vitamins to Soap and Shampoo. Shipping is free on all orders over $25 and there is no sales tax either (except KS, ND, WA).