What's the best buy for 2nd hand at 200 USD?

Hello there experienced hifi-dinosaurs. I am a student with limited funds and a love of vinyl, and I'm looking to replace my old sony turntable. In case it matters, I own a marantz receiver, i think it's a NR1403, and Boston BA25 bookshelf speakers. I want to try and make my collection of 70s records sound good without paying too much for a lack of knowledge. Any advice would be very much appreciated.