Penguin has a marked Maiden back (I think) deck for $10.
http://www.penguinmagic.com/p/8474
From what I've seen the markings are quite easy to read and are disguised well. The back is not a normal Rider back but no one will notice. It's very similar.
The ellusionist 1800 deck has easy to read marks hidden into their aging.
https://www.ellusionist.com/marked-vintage-1800-playing-cards-red.html
And there is a lot you can do with a marked deck. There are a few tricks I know that actually require a marked deck. One I do somewhat often is one where the spectator is able to read my mind and I read theirs.
With a marked deck, you can do some tricks you'd do with a stack but without having to reorganize the deck all the time. A lot of forces feel kinda fishy so with a marked deck, you can have the spectator pull out the card in any way they want. There are a lot of possibilities.
You could also make your own. There's this classic "clock" marking system a lot of people use. You can find it and others on youtube.
It's important not to treat the cards like a marked deck though. So try not to spend a lot of time looking at the backs unless it's justified. That's why I prefer reader backs (the actual value is hidden on the card) as opposed to actual "markings" which involve a coding system that only you know.
