If you are new to Aisle50.com deals, here's how it works.
Aisle50.com offers daily deals for groceries -- you buy the deal of the day from them via credit card, at around 50% off of the normal price and they load credit for that item to your grocery store's loyalty card. When you check out at the store with the item in your cart, the the total price of the items comes off your bill when you swipe your loyalty card (because you already paid for it on Aisle50.com). They alert users to the new deal with an email that goes out as soon as a new deal gets posted. You cannot use manufacturer's coupons on these items at the register since they are already paid for through Aisle50.com.
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