depending on what you want to do with your machine - -
I bought a a couple (well, actually three, altogether) old Singer Fashionmate Model 237 machines and had them serviced.
Counting cost, shipping, and servicing, I have between $70 and $150 in each of the machines.
They sew beautifully -
The only two complaints I have about them are: they are heavy and not easily portable - they can be carried around, but they weight quite a bit. (If you really want to know approximately one weighs, I could go down and put one on a bathroom scale).
The other complaint is that the thread holder is really rinky-dink and either comes off easily or breaks off. So I use a separate thread holder.
So if you just want something that does a decent zigzag and straight stitch, you might consider some of the older singers.