times change

https://www.usaudiomart.com/details/649418513-belles-150-power-amplifier/

perhaps like that one?

I think that person was overpricing that amp. I’ve seen similar like that go for $300 +/-

like this one:

https://www.usaudiomart.com/details/649457996-belles-150-power-amplifier/

Bingo
Yes that's it, ... err them

umm as for his asking price, I would have bought that.
just for a spare

just saying, they are spectacular amps and to find 1 is good, but to find 4

well i may have them for a while

Yes, they are spectacular amps. I talked a respected reseller of used/vintage equipment down to $700 for my 400A, but it still cost $100 to ship at 55lb. Not complaining though, I’m very happy with it, and my Vandy 2CE Sigs like the 200 wpc as well. So ultimately happy I found an even more rare 400.

They will kill me here
but i have a video of my system
Pink Floyd the wall with 2 sets of Bose 901's and 2 sets of Bose  Accustom shacking the curtains
be nice, it was recorded from my phone
so tomorrow when I'm not drinking ill try to post it... or will try to