Duck Pond
I had great success with a Duck Pond. It made a lot of money ($600) and there were almost no expenses. I had students bring in small prizes: things from fast food restaurants, hair ornaments, bracelets, just small objects kids would like (even some school supplies). These were divided into regular and special. All were put into small bags (and labeled B (boy), G (girl), or E (either). The special ones were put in different colored bags. The pond was the deep lid of a storage container. I bought about 10 plastic ducks and marked (on the bottom) two with a colored dot. These were the ones that got special prizes. Kids manned the booth but had ato be savy about their customers noticing which ducks had the dot (and hide it when they were swirled around between customers. I think the success of the booth was caused by getting the unknown, so the prizes MUST be in bags.
If you choose to do this and need more info (how to get kids to bring in the prizes, etc. ) just send me an e-mail. This booth made more money year after year than any other in the school. However, at our school all the money was pooled and then divided, so I got no more than someone who only made $30.