What is the price for taxi from PEK Airport to Brickyard Retreat GPS: 40.433,116.556 for two adults?

Well, the cab fare is CNY 220 to 230. But maybe you cannot find a regular taxi easily because of the long-distance.

If it is the case, you may need to hire a private car. As far as I know, TravelChinaGuide has car rental service. They can take you to the destination directly. The fare is economical and the service is warm. The contact information is bookingtravelchinaguide.com.