Are you a Dungeon Master? Do you think you’re a Dungeon Master? Do your literalist parents forbid you from having dice because they are witchery and won’t let you be a Dungeon Master? Why not build your own 20 and 100 sided die simulator.
The kit uses an Arduino board and a single switch to select the dice size. It’s not amazingly complex, obviously, but it’s a noble effort and looks very electropunk.
The same DIYer made a 6 sided version complete with mercury switch to add a frisson of realism to the proceedings.