The SZX market is similar but with different things than the Shanghai 580 market.
Directions: From the Crowne Plaza go across the street and go left to the corner with a big intersection (maybe 200 yards). At the corner turn right. You will see a subway entrance in about 50 yards. Go down the stairs. You are entering the subway at one end of the line and the market is the last stop at the other end of the line. Buy a ticket from the easy to figure out machine for about 4 or 5 whatevers. When you get off at the last stop. The station is large with many exits. Take the big staircase (one is much wider than the rest) Go up. I usually end up in some parking garage and take an elevator up. The market is above the subway station. Prices are similar to Shanghai but selection is somewhat different.
The people are initially a bit more aggressive than PVG market but they leave you alone after they think you know where you are going.
Hope this helps.