I have a couple of Square D QO Breakers Panels for $170 each. They are 225Amp, 42 spaces, 42 circuits. Comes with front panel. Can be straight wired or you can install a Main Breaker. Will accept QO main breakers (200 or 225). I like the 225 Amp box over the 200 because the bus is a little heavier. I use them for solar where I backfeed the bus. If I use a 200 main breaker on a 225 amp bus, I can backfeed 75 amps of solar.
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Keep in mind this comes with the front panel which is usually sold separately. Price is firm since it is a good deal.