I paid 50.00 for mine at an estate sale near the beach in Los Angeles. I think the company was called "We Don't Really Care Estate Services" Everything was underpriced (i wasn't complaining) but had the owner seen it, they might of been pissed and rightly so.
It was my first Atmos clock but at 50.00 i didn't think i could go wrong. After doing the research on the possible cost of repairs, i realized i had dodged a huge bullet since mine was working perfectly.
Since then i've seen at least 3 of them at sales, none being offered for less then 1500.00, and they never last more then an hour!!
You did good for 250.00 From my earlier research, the very early models sell well, late models sell and the odd ball models sell. There is a middle age bracket that just doesn't command a high price but for 250.00, you paid half of what the lowest price models will sell for.