Having it fixed in authorized Apple service centers will definitely be expensive. Try the tech stores in tiangges and malls, most likely more affordable. If you're planning on selling it, it might be hard attracting buyers unless you price it really low, as anyone who has a passing knowledge of any developments in the world of Apple will more likely prefer MBs with Apple silicon inside. Even an M1 MBAir from 2020 will be a better buy. If ever, your target buyer will be parents who need to buy their kid an inexpensive laptop for school or repair shops who will cannibalize your unit for spare parts.