Karen Bleier / AFP / Getty Images Extreme couponing is getting a little too extreme for some stores.

For extreme couponers who pay only a few bucks for an entire shopping cart’s worth of goods, or even earn money on their shopping trips by reimbursing coupons with a higher value than the item’s price, couponing practically functions as a part-time job. Stores are ready to give them the pink slip.

Supermarkets popular with extreme couponers have a delicate balance to maintain: They don’t want to alienate their coupon-loving customers, but they also don’t want to disappoint non-extreme shoppers who can’t buy sale items because some shopper with a file folder and dreams of TLC stardom just emptied the entire shelf of product. To that end, some grocery retailers are adding to or clarifying their existing coupon policies.

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The Detroit News profiles one extreme couponer who admitted her quest to buy 34 containers of chocolate milk at once was “a moneymaker,” since she intended to get 11 cents back each by combining a coupon with her local Walmart’s sale price. While the store manager did allow the shopper to score her $3.74 cash back, the process was, according to her, deliberately annoying. Each container of milk had to be rung up as an individual purchase, and the cash back was doled out 11 cents at a time, along with 34 separate receipts.

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Walmart wouldn’t comment on this practice when asked by the newspaper, but increasing the hassle factor for extreme couponers is only one of the ways retailers are trying to limit their losses and keep shelves stocked in the face of this fanatical frugality.