I used them in Georgia to buy from Costco. Their service and convenience was 5 stars but when I compared the prices I paid through instacart to the store prices I was not happy about it. I paid $165 for $132 in groceries and that did not include my tip for the driver. That's about 25% more which defeats the purpose of shopping at Costco but it was definitely convenient for a single dad! I did read that some stores have in store prices so that might help.