You never know what you're going to find. I was searching for copies of the Sandy Koufax short print and I typed in "2011 Topps 530" (because that's the card number). In amongst the Koufaxes and the Felixes (how great is it that they share a card number?), I found this card.
It's a 60 Years of Topps reprint, and it's an original back. It was listed because in the original 1968 set, this card was #530. And at a very reasonable price, it's now mine.
Like I said, you never know what you're going to find.
Photo courtesy of eBay