It’s a time saver, first and foremost because shopping is done from home.
It’s convenient. My dog is having major surgery the same week that school starts which means I’ll be more or less housebound for quite some time. The more I can have delivered, the better.
I can use my existing Costco membership. In my experience, prices were the same as in they are in the store. If you don’t have a Costco membership, you can still order with a 15% surcharge.
It’s fast. I never order from Target online because the shipping time is slow but now it can arrive the next day. It’s the best place for use to buy birthday presents.
I will save money because I tend to impulse buy random things at Costco (and elsewhere) when shopping in person. I am more risk averse on the computer.