They are neat old "Garage Art" for the most part.
I think there are a few guys out there that sell parts and such.
The problem like with any large item is logistics, which will always make for a hard sell.
I sold a 720 with all the bells & whistles still with it. Even had a full Card Catalog from '60 to '70 something IIRC.
The test leads were all very dry and brittle so I never attempted to power it up.
This affected price.
I think I let it all go for way under $500 but it was years ago.
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When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car. 
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