Can I buy a Nikon camera body that already has autofocus, then purchase any non-autofocus Nikon lens and be able autofocus simply from the body itself?
No. Modern autofocus lenses require motor in lens, older were motorized from body but were marked as AF capable. If lens is non AF it cannot use AF.
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This is a correct (and succinct) answer, but please don't answer questions which are clearly duplicates — it just muddles things up. Instead, provide your answer to the question linked above. Thanks! – mattdm Apr 2 '15 at 16:54