Most people can’t even find ONE right now, so I don’t think this is even potentially possible, nor would they have any incentive to give you any sort of deal, given that the demand dramatically outweighs the supply.
It would probably be best to ask Oculus. This is a community forum.
If you are buying them for a company event, that sounds like a commercial use so you should go through the Business program. They can probably handle bulk orders better, since consumers trying to buy more than a couple of Quests is liable to be considered a scalper and the order would be refused.