My Oh, Really! game is present throughout this blog, but before it was Oh, Really! it was What's It To Ya?. It is a fun game that is useful for initiating discussion about values and opinions.
My friend who published that older version of the game is now blowing that inventory out for only $2.39 per copy. Check it out here at Fair Play Games. (Note that I am no longer getting royalties from the sale of this edition of the game, so sales do not benefit me directly.)
Each copy will allow up to eight players to play, so four copies will probably be enough for most classrooms. But beyond the K - 12 classroom, the game has entertained everyone from couples and families to Sunday school classes and college students. This is probably the best price you'll find on the game, so consider ordering a few.
And here's a rules explanation you could use in class or anywhere else to teach everyone how to play in about four minutes. (And after watching you can see it's pretty easy to make your own set of the game with note cards.)