Someone help me find recording equipment for high quality smash bros commentary!

[Nips]

I'm holding some smash bros melee tournaments in my local area and we want to record some commentary but we don't have all the equipment we need. So far we only have recording equipment to record the game but we don't know how to record to commentators at the same time. It would help me out a lot if someone could tell me what equipment I need to buy! Thanks!