I know he has a set of die...but mentioned he would like more at sometime.
"Dungeons and Dragons uses any standard
7-dice set. In fact, the 7-dice set is the gaming standard because of D&D. At a minimum to play you'll need one each of: 4-sided dice, 6-sided dice, 8-sided dice, 10-sided dice, 12-sided dice, and 20-sided dice. When you buy a standard D&D dice set you'll also get a second 10-sided die that's used for percentile rolls.
While most gamers prefer to have several sets on hand so they can roll larger dice pools without needing to reroll any dice, you can roll everything that needs rolling with a single standard dungeons and dragons 7-dice set."
This site has nice sets and contains that info. Basically if you have a few sets you need to re roll ones you rolled already less...
Grimmy