Nintendo World Cup Soccer 4 player?

In Buy/Sell/Trade

I've always wondered why my World Cup Soccer game says it supports 4 player VS. mode but have never understood how when there are only two controller plugs on the NES console. where there splitters made for the NES similar to what PS2 has, and if so where could I get a couple?

And why is this in buy/sell/trade?
Yeah, several other games also supported 4 player. Super spike 'V ball for example. You have to buy yourself a Fourscore, or a NES Satelliate

Sorry, i couldn't find a general FAQ thing... kinda looking if someone was willing to offer me one for sale

guess i'm off to ebay to find me a fourscore then