The staff at K&B True Value know what keeps their customers coming back: laundry detergent. For the past few years, staff at the Annapolis, Md., store have offered a laundry detergent filling station for their customers, giving them an easy way to reuse bottles, save money and be eco-friendly.

Customers can bring in empty detergent bottles—generally either 50- or 100-ounce bottles—and fill them with Sun & Earth laundry detergent. The cost is $4.99 per 50 ounces. Sun & Earth laundry detergent had previously been sold at the store, but owner Jared Littmann didn't know about the refilling station until the company approached him.

"This service seems to grow each month and year," Littmann says. "In the past 12 months, we've had more than 600 sales. We treat it as a loss leader—our goal is to use the low price to get customers hooked on something they can only get here, and then have them shop while they're here in our store."

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