Many of the groupons around here (in the DC area) at nicer restuarants are around $20 for $40....so basically, if you go, you get $20 off...but have already paid $20. So your bill is $40 off. I'll usually use that to buy a $40 bottle of wine w/ the meal...so, essentially all I have to pay for is the meal (as the other $40 is taken care of). I know many of the restuarants I've used have re-issued the offers over and over. You can see how many are bought also...which tells you if its a good deal.
I just used one last weekend w/ a girl. We went to a winery about 60 miles west of DC. It was $28 for an $80 value. It was great/awesome. Well worth it.
There's a Korean Spa (no happy endings) that's opened 24/hours a day that ran one recently. It was like $17 for entry (which is normally $35) they sold around 1200. This is just for entry into the spa....no services.
---