Central Market (Pasah Thmay), Phnom Penh
This is a large market with lots of independent shops and stalls. It is very crowded and hot in there. The building is unique.
What to buy: In here you can buy Jewelry, be careful though about that. Homade crafts, clothes, some electronics, books and food. Cloth is also there.
What to pay: Prices vary, bargin.
There is not much you can get here, it is large rather than huge, radiates from a central building that has 4 arms. Very well laid out.
You could spend hours here exploring.
What to pay: Remember to bargin :)