I have no idea on the offer but $100 seems reasonable to offer. Did he counter? He can always decline. Prices vary a lot. I paid on the higher end, $220, for my treadle but that is because I wanted one like that. The head was in very nice condition and it was in O.K. fixable shape. No parts and no manual though. I had the opportunity to buy 1800-s phinx Singer and more ornate cabinets in running condition with parts and booklet for $150 but by passed because it was not what I wanted. My time and DH's is valuable too. It seems similar machines can flex from $40 to $400 a machine for treadles on our CL with no rhyme or reason as to how old they are or in what shape. People seem to look at ebay and think they have $350 treadle because they see something expensive there while what they have is something sad because it was left out in the yard.