my 'back-up' machine is a 1956 singer 99-K; stitches like a dream- easy to maintain- goes to work/classes with me- cost me $20!
but if you want something new- i recommend the inexpensive brother machines from wally world- you can pick one up between $89 & $139---good basic machines- my granddaugter's have been using them for 6 or 7 years now- no complaints- they do what they need them to