You can buy it on Taobao.

Gold foil is a thin sheet made of hammered gold. Because gold has good ductility and plasticity, one tael of pure gold can be hammered into a gold foil with a thickness of one ten thousandth of a millimeter and an area of ??16.2 square meters. That is, one gram of gold can be made into about 0.5 square meters of pure gold foil with a thickness of 0.12μm.