Clothing and Soviet era items. Things are donated by visitors, and you MUST either bring something of value, or pay a 150 rouble ($5) entry fee. Prices? Pay whatever you feel. Proceeds are donated to charities.
Vetoshny (“rags”) pereulok 13, 4th floor, next to the doll shop. That’s right by GUM, on the east side from it. See vk.com/lavkaradostej