Start your bid offer at $50.00 max, because if she wanted $150.00 total for machine in the cabinet and you're not taking the cabinet, I assume the cabinet will be at least $75.00 depending on the condition of the cabinet itself.
No feet included is something you would have to collect for your machine.
I paid $20.00 for my 301A Long bed from CL and the paint's chipping in some areas, but it's functional. Then I invested $60.00 worth of parts at my Singer Dealer shop (new foot pedal, 4- bobbins, bobbin winder tire, Singer oil and new straight foot) this totaled to the amount of $60.
I cleaned it up, oiled it and lubricated the gears/ because for servicing it will be about $65.00. The bobbin case is very expensive; make sure that is not corroded and your foot pedal wiring not frayed or taped wiring.
All Singer shops SHOULD carry parts in need for these machines.