RE: Decent yet cheap sewing machine?
I think in your case, with a budget of $100, a second hand sewing machine would be great. I think you would be very unhappy with a new $100 sewing machine. I would go to either a sewing store that also sells used machines or a sewing/vacuum store, they tend to sell used machines also. One bit of advice, it isn't how many layers of denim that a sewing machine can sew through that is really important. It is how well it goes from sewing on 1-2 layers to sewing on 4-6 layers that really matters.
For your needs, you really do not need a ton of fancy stitches. You might be able to find an older metal machine that will sew like a champ in your price range. That way you'ld get a machine that does a great job on a few things (but the things you need) rather than a machine that does a poor job at lot of things. My machine is probably 15-20 years old and it still works great. Granted, I'd love a machine that no one else has ever owned but in the meantime, I'll stick to my old metal one.
HTH
Veronica
Miss Ellie 11/03
Baby Audrey 4/08