Plastic Sliding Puzzles

[UK Printed Mugs]

Has anyone come across those promotional square sliding puzzles for sublimation? A couple of China listings come up in a Google but no UK seller.

Else, are full colour sliders done via screen printing, DTG printer or perhaps just plain old stickers applied carefully?

[pisquee]

I certainly remember some had stickers when I was a kid, just like Rubik's cubes did ... Making both very easy to "do"!