This one was a tricky one. At first I was debating on some kind of perfectly square bic lighter or a very chunky electric chair and I want to plug in my ipad and it hit me

Available in raw resin $10 and painted $20 (last picture is an example of a random unpainted dice)

All my dice are made from solid 3d printed resin. The painted versions are sprayed with 3 layers of clear coat so they are usable but I would suggest rolling them on a soft surface to avoid chipping or wear and tear on the paint job.