What is a good product to sell?

I have to sell a product in my marketing cl, and I have no idea what to sell. Obviously, it needs to be something people would want to buy. Also, I need to be able to bring it in to show the cl, so I can't sell a car or something like that. It needs to be a product with some flaws, because I need to point those out as objections. This should be easy for me, but I'm having quite a difficult time of it.