3D printing is both cheap and easy. Yes, it takes a while to print each die, but I'm willing to spend that time, and as a college student I have the time to spend waiting on a print to finish.
Yes, 3D printing is NOT always perfect, but injection molding is SUPER expensive, and people who have tried to kick-start braille dice like that have always come short, so I wanted to do something cheap enough to actually make the funding goal for. Thingsverse has plenty of dice files, so while it may not be pound-of-dice company quality, I know it's possible to make them balanced! Generally, the way you do this (and the way I have made them) is by making sure opposite sides add up to the number of sides on the die +1. Seriously, grab a die and look, it's really cool!