Russian Forbes mentions Udelka as one of the top 10 flea markets in the world and it is a cool place to get away from the city center. The most popular time for going there is from 12 to 16 on weekends, though it works other days as well but with less choice of course
View Gallery
View Gallery
View Gallery
It is actually a great place for treasure hunting if you're in the mood for this kind of things, though it might be a bit difficult to find: from metro Udelnaya go to the right, cross the railways, then turn to the right and keep going as long as you can (there will be some crappy shoe/clothes kiosks, just ignore them)
Seeing a foreigner they can insanely overcharge here, so if you have opportunity do go there with a local friend and have a great hunt!
Sa-Su: 11:00-17:00