It can be daunting to figure out the cost of replacing a MacBook screen at an Apple Store. If your Mac is older than 7 years, you'll need to go to a repair shop other than an Apple Store to get the job done. I have a page dedicated to the costs of repairing the MacBook Pro screen and providing screen repair services for MacBook Pro. Damage caused by falls, bumps, and accidental movements at work or school, or the dreaded dead pixel issues that plagued earlier MacBook models more often than today, have given Apple repair technicians plenty of practice in the past to repair or replace a damaged screen quickly.
The cost of repair tends to decrease over time, so repairing older MacBook Airs will be cheaper than newer ones. If your Mac, iPhone, or iPad is part of one of these recall or repair programs, you may be able to get it fixed for free. The actual store-level repair capabilities seem to vary from store to store, but all the Best Buys in my area don't have Mac technicians in the actual store. Additionally, the company has always stated that only authorized service providers should open a Mac and perform repairs and upgrades.
Knowing the basic components needed to complete your MacBook screen repair will help you choose the right repair for your needs.