What game have you played that required lots of dice?
I seem to remember that Warhammer 40K often required more dice than we had available - I had a very big shooty Ork mob that rolled a stupid amount of D6's. I think it was something like 20 figures and they had 2 bolt guns each.
For board games, Brian Trains excellent 'Scheldt' game often has me searching around for a few more random number generator cubes.
“O Lord God, let me not be disgraced in my old days.”
'We few, we happy few, we band of brothers'