Two cubes

Two six-sided dice, where one with three blank sides and three two-pip sides, and the other has three one-pip sides and three two-pip sides, have an equal distribution of 1 through 4.

A faux d4 that has the same table feel as Monopoly, Craps, Traveller or Apocalypse World.

You can also emulate a d9, a d12, a d18, a d36 and dumbly enough a d6 this way.

9: 1,2,3 and 0,3,6 (two of each side)

12: a normal six-sider and a 0,6 (three blanks and three sixes)

18: a normal six-sider and a 0,6,12 (two blanks, two sixes, two twelves)

36: a normal six-sider and a 0,6,12,18,24,30 (one of each side).

and last and definitively least, 6: 1, 2, 3 and 0, 3