I have two sets of dice (d4-d20); I have a d30. Tried a d100 (hated it). I also have a a bag of random dice: 3d4, 12d6, 6d8, 7d10, 3d12, 5d20. This assures me that the characters had the dice they need, and, if a die seems unlucky, then they can roll a different one.