Yep, I agree with getting a used machine. You can look at all their features and not buy something with functions you don't need. I bought a basic used Singer about 35 years ago for $100 and it still works for what I need. It does zigzag and straight sewing - that's all I've ever wanted. It came with a buttonhole attachment but I've never used it, have used the zipper foot a few times.
sue- knitting heretic