Is there a legitimate place to buy Steam keys in bulk?

Company I work for has game nights (with prizes) as team building, mostly play free games, but occasionally a paid game as well. This week's game is paid and am looking for a place where I can buy about 20 Steam keys for the game that's legitimate.

Steam will only let you gift a game if you're friends with them on Steam, which complicates things and would be a pain.

Game is Move or Die in case that matters.