Pantip Plaza
A six-floor shopping mall devoted to computer gear, famous for its pirated media. The bootleg trade is much more low-key than it used to be, but software and DVDs are still widely available. It is also a good place for digital cameras, gadgets, printers, MP3-players, etc. Test out whatever you are buying as there are lots of flaky goods here. If you want to be safe, buy at the official brand stores, though prices are similar as in Western countries or even higher!. And keep in mind that warranty is only valid within Thailand.
Krungthong Plaza
Krungthong Plaza is another big shopping mall with apparel sold at wholesale prices. The mall has more than 600 shops inside, almost all of them about clothing, shoes, bags, cosmetics and accessories. There is an excellent food court on the fourth floor.