Budget tuner?

I was thinking of putting a tuner on my system just for periodic FM listening. If possible, I'd like to keep the price under $100 used. However, if there's nothing decent in that range please let me know. I don't know anything about tuners.

I've seen some for $50 and some for $500. I don't know what the difference is. I just want to listen to the radio.

I appreciate any help you can give. I'm using a NAD 370 integrated amp.