If you want to buy Jade Guanyin, go to a special jade shop. Jade Guanyin in temples is very common. Next to Wuhan World Trade Plaza, there is a shop called "Fulin Emerald", which deals in all kinds of high-grade jade and crystals. All its products have the jewelry appraisal certificate of Geological University. There is quality assurance.
Since it's for my girlfriend, if you want to buy it, buy a higher-end one. A jade Guanyin is about two or three hundred yuan, and some are cheap. After buying it, you can take it to the temple and ask the monk to help you open the light, so that Jade Guanyin will be spiritual. There is no provision for the opening fee. Give as much as you want. I once opened a Buddha statue in a temple and gave it 50 yuan! It is best to go to Baotong Temple. Guiyuan Temple is now purely a tourist attraction.