if this was to me it's probably partially how bad Ohios economy is but, the 4100's here are generaly $500 and sometimes $450 and the 4500 is $450 to $325. I got offered an SL-X for $450 as well but, i don't see those out here much and if i had the money at the time i would have scooped that one up. Unsure if it was a 50-100 watt variant though. I don't see many combo models at all as far as the JCM900's go in this general area.
I was actually talking to the OP but was wondering where things are going so cheap so thanks for the info.