Groupon had a Instant Win Game called Clicky the Clickable Value Wheel which can win up to $100 Groupon Bucks.
Probably the best card to earn frequent flyer miles, the Starwood Preferred Guest® Credit Card from American Express gives you 10,000 bonus Starpoints after first purchase. This can be converted to $100 gift card. Earn one Starpoint for every dollar you spend. No annual fee for the first year; $65 thereafter.