Next year's theme being The American Dream gave me this idea:
A "Test Your Strength!" machine called "SEE IF YOU QUALIFY!" with various random credit scores from 300 to 850 (not in lowest to highest order neccesarily) and three different sized mallets with corresponding large dollar amounts on them ($5,000; $20,000 and $50,000 possibly). The idea is you can use any size mallet/money and the result of spending this amount still may not get you the credit score you need "to qualify". Someone who gets the 850 gets a gift of a wooden birdhouse or some other ridiculously insignificant house/car/credit card, etc.
(I work in the lending industry in case that wasn't obvious.)
Oh, and the barker should be dressed in a full suit and have a name tag that says "Senor Mort Gage". (Tribute to Homestar Runner).