I have a line on a Singer treadle in Salem, OR that's for sale. The guy is ASKING $50 for it, I'm pretty sure he'd entertain an offer.
I have his contact info at work, can give it to you if you're interested. From the photos, I can't tell what kind of condition the cabinet is in, but it looks to be fair, and of course it's dirty and will need some lovin' to be her best.
Looks like maybe a 15-90 to me? (I'm still too new to tell from just a picture!)