The one that springs to mind was the tiny pinkie pie notebook....
I remember that one. I actually mailed the seller and asked if it was a typo, or what it was that was so special about it. They answered it was their daughter that had set the price as she was the one seling, and that they where saving for a trip to disneyland. They had told the girl it would likely not sell for that price, but she had insisted. ^^
I'm glad there was something rational behind that. . . but still weird, lol