Sometimes these gems are beautiful and unique vintage clothing, or really high quality kitchenware for a bargain, and sometimes the value of a find is because it is incredibly nerdy:
R2-D2 thermos, Dr. Strange wall art, and Humphrey Bogart on a necktie; how much more cinema nerdy can you get?
Don't worry fantasy fans, I didn't forget you:

Medieval castle rubbings ready to hang in your dungeon/gaming cave, and yes that is a fully functioning water pitcher shaped like a dragon.