I was able to get it for an affordable price because part of the card is missing. Here is what the full card looks like:
The yellow part that is missing from mine is supposed to be folded back so that the green and yellow make an inverted V stand and the player is left standing up. You can't find too many images of the actual cards in the stand-up position since that would decrease the value of the card.
The picture on the wax pack shows you what it would look like.
I suppose that my card went back and forth between the flat and stand-up positions and eventually the yellow part just separated at the perforations.
The entire set is made up of 77 cards. Of those, 22 are short-prints. Billy's card is one of the short-prints. The SPs get really expensive, which is why I settled for the card I bought.
Ernie Banks is also on the checklist. He's not on the short-print list, but his card is still pricey because he's Ernie Banks. I'm going to have to be patient to get one at a price I'm comfortable with.