Sears, among other retailers, is using gasoline cards as incentives to boost spending.

Thanks to sky-high gas prices and a tight economy, retailers are using free gasoline as incentives to boost sales.

Sears Holdings Corp. is offering $75 Shell gas cards to customers who spend $100 or more on Men’s Dockers merchandise through June 15. The effort is part of the Men’s Dockers Father’s Day promotion.

“We wanted to honor Dads this year with something that they may really need and having an in-store promotion, such as the Men’s Dockers Father’s Day allows customers to get great gifts with an added bonus,” spokesperson Tim Danser said in a statement.

Sears is also running a sweepstakes offering a Toyota Prius as the top prize. Visitors can fill out an entry form in-store or download one from http://www.206inc.com/dockersgascard2008 through June 28 for a chance to win.

Sears/Rite Aid Offer Gas Incentives to Boost Sales | Shell Gas Cards for Men’s Dockers purchases.