List of Dvorak Keyboards
Here is a list of keyboards that have Dvorak layout builtin.
Ultimate Hacking Keyboard V2
Kinesis Advantage2
Vortexgear Cypher
Vortexgear Race 3
Vortexgear Poker 3
CM MasterKeys PBT
CODE keyboard
Mistel Barocco Split
TypeMatrix
There are more, but i list only the practical ones that are massively commercially made.