They have a cool (but totally creepy) Zoltar-esque promotion where you spin a wheel to potentially land some free Groupon cash. I just got a Whammy on my first spin, but looks like there's a 50% chance you'll at least win something. Click here to spin
UPDATE: if you Like them on Facebook, you get five more spins. However, out of six spins, I got five Whammies and one $5. :/
Has anyone won the $100 yet?