For an authentic shopping experience, head to Chatuchak Weekend Market, the largest market in Thailand offering a wide variety of goods at bargain prices. Navigate through the maze of stalls to find unique souvenirs, handmade crafts, and trendy fashion items. For a more upscale experience, explore the luxurious Siam Paragon and Emporium shopping malls, where you can find designer brands, upscale boutiques, and a range of dining options. Don't forget to haggle at the markets and expect to spend around 500-2000 THB for souvenirs and 3000-5000 THB for shopping at the malls.