We found this game for only $18 at the thrift shop today. It's very popular around here but a lot of people have never heard of it. You try to get the buttons in the hole, and to shoot off any buttons of the other color. In the end, outside ring gives you 5 points, second 10, middle 15 and in the hole 20. It's a game for two or four people.
If you want to know more about the game check out the entry in Wikipedia.