I have 2 of these. $25 each . They are over $500 new.
able to hook up microphones to it as well
http://www.spectrumaudio.com/bogen-gs150-150-watt-paging-mixer-amplifier/?gclid=CN6eruPZuMkCFRCGaQodl6wAOQ
http://www.bhphotovideo.com/bnh/controller/home?O=&sku=540472&gclid=CPuHwaDbuMkCFYQ1aQodCYMJpA&is=REG&ap=y&m=Y&A=details&Q=