Where to buy the replica purses in Beijing and how much?

You can buy it at the underground market at Silk Street, Beijing(https://www.travelchinaguide.com/cityguides/beijing/shopping/xiushui-street/) . The price is generally about CNY100~200.

If you are looking for GOOD quality replica purses that actually look real, the best place to go to is the Russian Mall and Market. The prices vary depending on the purse from 400-800RMB. but are worth the money. Purses in places like Silk Market and Yashow, are bad quality and look cheap and fake. Not worth even the 200 RMB.