You won't likely find a 4-channel amplifier that is 2 ohm stable when bridged. The only thing that comes to mind is some Rockford amps, maybe, but I don't sell RF.
I would sell the MXMA-3001 and MXMA-1502, which would give you 300W x 1 and 100W x 2, for $400. These two amps are very nice Korean built amps that are exactly the same size, so you can put them side by side and not have OCD kick in because they don't match. The controls are under covers on the top panels. I'm discounting them because the cosmetics on these first production run amps are not perfect.