What are the real basics to look for before buying a vintage typewriter? I've seen them anywhere from $20 at a flea market to $200+ online, and I'm not sure how to tell if something's worth the money. From what I've picked up so far, you at least want to check that the platen and feed rollers aren't rock hard or cracked, that the shift and carriage return work, and that every key leaves a legible mark on paper. Space bar, line spacing, and margin release should also be checked. For those of you who've been collecting longer, what's your personal cutoff point for price? Is $50 still the sweet spot for fixer-uppers, or is paying $150–200 fair if it's a machine you really love and it's in great shape?