Some more information: so lets say the back is red, the other side, the "face", needs to be vertically split down them middle so the one half is face and the other half shows a back OF A DIFFERENT COLOR to what the "real back is". In this case since the "real back" is red then the "face" shows half face half blue back.

The split needs to be done vertically in a way where if you spread the cards on the table with the split side upwards you can show either all backs (barring the top card which would show the split if not covered with an unsplit card) or all faces depending on which way you spread them.

Sounds like you need this deck custom made. Contact this company in Britain. They did a marvelous job for me with a custom print job of about 15 playing cards. The quality left nothing to be desired, and the price was reasonable.

https://printbymagic.com/

I was looking at that site earlier, good to hear the cards are good quality.

Do you know a price range it would take to make one deck like the one I described?

No I'm sorry I have no idea what they would charge for a deck like this. You would have to describe what you need, and they will give you a quote. In the end, I'm sure you'll be happy with the end results. I went in with some trepidation, but when I saw and felt the cards they printed for me, I was ecstatic: Custom made Bicycle quality. I'm going back for another custom job with 15 more cards.

Https://www.youtube.com/watch?v=bHsbjk_9DmM

There was a previous post to contact > http://www.martinismagic.com/ for gaffs

The gaffs I need need to be printed, not that type of literal split cards where you peel the layers apart.

This British company PRINTS the cards. They are not split cut cards. My 15 card set was split in the middle horizontally. They were were printed.

I sent them an email yesterday, I am waiting to hear back from them.

If you get other people interested, then maybe you could get a discount for placing a bulk order?

I don't know if they give bulk discounts or not. Havent heard back from them yet.

So a little update: I can not recommend print by magic based on my experience so far. A month ago (after Leo recommended them in this thread) I sent them an email asking for a quote, I waited a week and had no response so I contacted them through their whatsapp. I explained what I needed from them and said I had sent an email to them but gotten no response back. I had a quick response on whatsapp and the person told me he can give me a quote after 11 days, after his vacation is over. I waited more than 11 days and sent back a message asking if they had looked into my request yet. They read my message but never replied back. I waited a few days more and sent another message. Again within a few minutes they read this message on whatsapp but never replied back to me. Its been now like a week since that last message I sent them that they did read but did not reply to. So I assume they have for some reason just decided to ghost me, instead of saying that they are unable to do what I am asking them for or saying that they don't have time now to do it due to being busy etc they decided to just completely ignore my messages and leave me hanging.