I use the EA Doubler. New are 800. If you can find one used, I've seen them for 600-650. GREAT amp, but isn't the loudest for slab. I am just a jazz/fusion rat, so for me, it's perfect. If you need more, just run a line out to FOH. It works perfectly for doubling gigs for me.
Jacochops and Wilbyman...President and Vice-President of the Uber-High End 4 string Addicts Club