Twice I've gone to walmart.com to load up my cart and get free shipping. Both times I ended up leaving empty handed because I got to the checkout and one or mor

Twice I've gone to walmart.com to load up my cart and get free shipping. Both times I ended up leaving empty handed because I got to the checkout and one or more items didn't qualify for free shipping. I get that there will be exceptions, but they could sure work on telling me that before I get halfway through the checkout. In both cases I ended up back on amazon.