PA System: Alternative to a beneficiary?

I am trying to think of an alternative to using a receiver which have an amplifier in it in my PA setup. I own a mic going into a mixer, then going to a receiver which is connected to two 300w speakers. I am have trouble finding a receiver of 600w power. Anyone have any suggestions.

Answers:    Sun Powered mixer
Can you transfer a playlist from one..
You don't want a beneficiary, you want a PA class amplifier, likely two 2 channel unit, and bridge them.