I've found great tuners in Pawn Shops also. My favorite was a high end Yamaha I paid $180 for. Decided I did not care for the sound and sold it for $350.
In my opinion the biggest mistake some people make with tuners it not using quality interconnects, like they will for their CD players. I am talking about mid-fi tuners like NAD, Rotel, Onkyo Integra, Cambridge Audio. They have a sub $100 pair of cables for the most part. I use Siltech ST-18G3 cables ($300 per meter) on my two mid-fi tuners and they sound pretty close to my friend's $1000+ tuners with cheaper cables.