I know of some people who do this. Basically, list tons of items on Amazon from local speciality stores, Costco, etc. They markup prices, of course. Then once a day, on their way back home, they pickup stuff that was bought, pack it at night, and then ship it in the morning. You are basically paying for someone else to shop.

I was introduced to this side-hustle by my friend and did this for a few months, but it was too much of hassle for very little return. Very hard to scale.