What kind of product would you pay $2 for through the mail?

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I was talking with a friend of mine yesterday and we were trying to come up with ways to make money for a project of ours. We were thinking that something VERY cheap that might be within the reach of lots of people by mail order. The thing is, we can't come up with an idea for this cheap item. What kind of mail order item would you be willing to pay $5, postage included? Info on some subject? Some small item? Let you creative ideas flow and let me know what you come up with! Thanks. TIM