If you ever offer your customers a discount of any kind than you should consider using Facebook Offers. Facebook Offers is an easy and cheap way to offer specials and discounts on your Facebook Page. There are three types of Facebook Offers that a Page may purchase: In Store Only, In Store & Online, or Online Only.
The one hitch is that Facebook Offers are only available to be posted by Facebook Pages, not individuals, that have 400 or more likes. For step-by-step instructions on how to create an offer and tips on creating a great offer that your fans will like, check out this Guide to Facebook Offers.