Huh? No, you'd read that and then not order it in the first place.

Nope. The OP was over-generalizing it as inherent to online grocery shopping, the reply pointed out they just need to pick a different seller.

They wanted items from Costco at a fair price. They didn't want items from a "different seller", whatever that would mean. But, sure, pretend that Instacart is doing a good job in the free market or whatever. Everyone else knows that it isn't the right way to do it