This week Walmart announced it's expanding its grocery delivery service, but how does it compare to other offerings from major players like Amazon and Peapod?

To find out, CNBC Make It compared prices listed online from Amazon Prime Now, Peapod and Walmart for delivery in the Northern New Jersey area. We crunched the numbers on 25 everyday grocery items, looking at a mix of national brands and each retailer's store brands, as well as both organic and traditional products.