Lowpoly Studios is running a contest offering a free banner for 2 weeks on our Flash games portal AskFlashGames as prize.
The spot reserved for the contest is the 160x600 side banner showed on every page with a game on it (example page).
A good banner placed on that spot can easily get tens of clicks per day so the prize is worth tens of $.
For more info about how to enter the contest and all the rules, check the contest announce.
If you have any question, please don't hesitate to contact me.