Not quite sure if this what you were thinking of for the children's Christmas stocking.
The market is situated on the 3rd East Ring Road, and will be more easily accessible when the No. 10 metro line extension south is finished. So of course before then you should have a guide to take you there.....and also to help you bargain. Beware, starting prices will be higher if you have a 'foreign' face! It is open 365 days in the year, but weekends are still the best time to go, though you would be joining 60,000 others on average with the same idea. Even if you visited 80 stalls a week, it would still take you one year to visit all 4000 stalls and their 10,000 staff!
There is a huge variety of stuff to look at, great for Xmas shopping......antiques, paintings, jewelry, classical furniture, books, folk art, chops and seals, snuff bottles, stamps, porcelain, Chairman Mao alarm clocks.......And the latest addition...yes diamonds in the flea market, started by a Ms Yang in August this year! That really is going upmarket. She helps customers choose using her secret TGF method. Also, there's now even a cafe (but no Starbucks yet) so you can sit down whilst your partner takes his or her time looking around.