The link appears to return national grocery stores chains and not other types that carry the product (local mom & pop stores, hardware, etc). I personally buy mine at my local hardware store since it's convenient (plus I'll do anything to be able to tell the wife I need to go to the hardware store ).

One cool thing on the link was I clicked around and got to the website for borax and you can download a coupon for .35 cents off per box... http://www.20muleteamlaundry.com/#