Sometimes you just really want a Big Mac. Or five. Today, D.C. based LivingSocial is offering a deal where you can get vouchers for five Big Macs and five large fries from McDonald’s for just $13. At first blush, the low price seems…silly. McDonald’s is already really cheap!

But people love a deal, and more than anything, it’s a way for the company to snatch up new subscribers. Just like the Amazon and Whole Foods deals before (both of which sold out at 1,000,000), this one is likely to appeal to a wide swath of people—-and give Living Social access to several thousand new email inboxes. All the better to fund their new offices on 7th Street and New York Avenue NW.