Funny thing about stools - often they can cost the same or MORE than getting a cabinet with a machine in it. I've paid as much as $60 to get the correct stool for a cabinet I picked up for $30 with a machine in it LOL!!
Along with collecting Singer machines, I also collected Singer cabinets, and it's no good having a cabinet without the correct stool to go with it. I'm still looking for the trapezoid cabinet - I already have the stool for it though.