Too Many Toys

The amount of toys in this house is overwhelming. The kids have so many things to play with and all they want to play with is what someone else has. I know this is not a new problem in the history of motherhood but in this house it is new. I'm at my wits end with the fighting and crying over a toy that nobody cared about seconds before. Not sure how to remedy this problem but looking for ideas and/or suggestions on how to make things a bit easier. The days of fighting are just beginning I know....I'm looking for some tried and true "tools" to help me along the way