Yeah. I got my pictures from wopc actually. Those can be really pricey eh.
I know they were made originally in 1895 - 118 years ago. That's a long time. I don't know if it was continued for a while or what, but I do know they're not only old but highly sought-after by many collectors.
The only way you might find one on the cheap would be to either buy a deck in less-than-ideal condition or buy swap cards - individual cards from the deck rather than the whole deck. The thing about swap cards is that for a deck like this, where every single face is completely unique, you're going to want the whole thing - singles are more for people interested in a deck's back design, in which case all the non-ad cards will have the same backs and most of the decks collected will have a more standard face design.
I think as playing cards progress deeper into "custom deck" territory, especially full-custom, I suspect that singles will lose some popularity. The new decks will be so unique, people will want the whole thing - to do otherwise would be to miss out on some impressive art. But that's just my educated guess.