At Best Buy, you'll get "enhanced curbside service" where you can not only pick up online orders, but ask store staff to fetch and sell products if you couldn't order them online. Delivery is still an option, although Best Buy has paused in-home installation and repair and will only drop off products at your door. You can still get in-home consultations during this scaled-back period, but you'll be limited to virtual help for now.
GameStop's move is unsurprisingly simpler given the products it sells: you're limited to conventional curbside pickup and online deliveries.
From the article: