What is the price of floor heating insulation board in Shanghai?

As far as I know, the prices of floor heating insulation boards sold in the market range from several hundred to several thousand yuan, and the prices of different materials are also different. Generally speaking, the price is still very expensive! Details are as follows:

Yahua pear insulation board, specification: 1800* 185*20, price (RMB/flat): 880.00.

Specification of tomato insulation board: 910 *123 *15, price (RMB/flat): 587.00.

Specification of teak insulation board: 910 *122 *18, price (RMB/flat): 1388.00.

Specification of mahogany insulation board: 910 *125 *15, price (RMB/flat): 3889.00.