Springfield swap meet. Quimby opens the whole thing up by announcing: "ich bin ein Springfield swap meet patron", Quimby mutters something along the lines of "the only thing you can't buy here is dignity". Moe is selling clamshells hand painted to look like Lucile Ball. Homer is rifiling through boxes of priceless things throwing them aside: airplanes upside down, strata-whovious and so on.

I believe it's the episode where they find out homer was in a band. The Be Sharps (or B Sharps?)