I have a very basic Singer one -it does one type of stitch and goes forwards and backwards. Thats it.Do you mean that basic?
Its a very old Singer one that my Mum bought for me years ago as a serviced/reconditioned one from a sewing machine repairs bloke so it might be looking in your Yellow Pages to see if theres anyone in your area that repairs and sells machines.
A friend of mine bought one from Lidl recently for around £50-70 I think -it does a few fancy stitches too.
There was an article in the Family section of the Saturday Guardian a few weeks ago about basic sewing machines. It's probably online somewhere but I can't find it because I can't remember the columnist's name. She has an Italian name, something like Anna Barbarella. Maybe someone will be along who remembers and can find the article?