Pretty much anything you buy on eBay... even if the product is in reasonable shape, it never is quite what you expected.
True, the A600 I won recently unexpectedly even had a 1 MB expansion in it.

On topic: The iTunes coupon we bought as birthday present for our colleague. When he tried to use it, the iTunes store claimed that it had already been used.
Money: 25 €
Value: 0
What a ripoff. 1st and last time I ever bought any i* crap...