This is a webshop where I sell card decks made by me or my friends.
Most of them you can also print yourself for free (especially the programming themed ones)
I write the programming related card decks with the help of my daughter, and the main goal is to teach her the subject of the deck, or to use the deck somewhat in the current topic that she is learning.
To print the decks it costs about 15$ per deck if you print 50 or so, and then it starts dropping to 3-4$ per deck if you print 300, and can go lower if you print more than that.
There are many printers that specialise in game cards, so you can just google one in your country.