Lara122,
Ah one of the best of the Kenmores. That is a 158-52x machine. Made by Maruzen / Jaguar.
I have the 158-523 in a cabinet and it is a very quiet, strong sewing machine. It takes the large flat cams and sews real nice stitches.
All metal inside, and simple to use. You have the manual and some other accessories, the cams are not terribly hard to find. We found ours at the LSMG and I've seen a couple sets on shopgoodwill.com.
I do not think $40.00 is too high, but I'd still want to go lower ... if I could.
The second machine is a 128. Buy them, clean them up fix the second one, then keep one and flip the other.
Sorry, I'm a terrible enabler.
Joe