Even including delivery and tip, you'd probably still come out ahead, or at last break even. And Instacart will get it to your door same-day in many cases. Costco.com will take at least two days.

Grocery delivery apps like Instacart are a popular choice for busy ... Some examples of retailers that are supported include ...

Enter Instacart, who will do the shopping for you. The food delivery startup ... Most locales offer Costco, Harris Teeter and Whole Foods as delivery options.