Note: all of these are specifically for Warhammer 8th Edition and below. I don’t really play Age of Sigmar.
This is warhammer so you have to buy in bulk. I like the 36 dice sets from Cheesex:
By far the best choice here is the Tectonic Craft Studios. They are perhaps the best known for their laser cut terrain, and that’s what you’ll primarily see at their con booth, but their movement trays are fantastic. They are customizable, robust and perfect for any army:
Naturally, if you just want to cut your own out from cardboard, I recommend using my movement tray generator: