I have an effect in mind that requires a double face deck with one side all having the same face. Is such a deck available on the market or do I have to have it custom printed? Thanks in advance.

If you mean a deck with regular backs but with all double-sided fronts in the sense of having “split” faces (one side all different, the other side all the same), then that would be the classic Monte Cristo deck, also known and more recently marketed as the Mastermind deck.

If you mean a double-faced deck in the sense of no regular backs at all, with one side all different full faces and the other side all the same faces, then I don’t know.

Karnak, I meant the latter you described. Thank you for clarifying.

You could use a Phoenix Double Decker (1 regular deck and 1 force deck) then you could use R/S or even glue if you want. It would be the same thickness as a regular card.

I guess Card-Shark could have something like this in Stock, if you ask there by eMail. Not everything is on their Homepage. The Double Deckers are a nice idea as well (Phoenix is a brand by CardShark).

Basically you want a regular deck (faces) with a rather unusual "back" design - where the back design happens to be a card face.
I think a lot of printers offer this service.

Here is one in the UK. They have been recommend on the forum I think, but not used them myself.
They use Bicycle blank backs as their print stock -

https://printbymagic.com/custom-printed-......g-cards/