Google's Express delivery service has just gained another big player in addition to Target and Costco: Walmart. Soon, you'll be able to buy items from the major retailer with your voice through Google Home or via the Google Express website or app and then have your purchase delivered to your home. That's made even better by the fact that the service now delivers for free, so long as you meet a merchant's minimum purchase requirement. Unlike Amazon Prime, you don't even need to pay a membership fee. Besides having thousands of items to choose from -- everything "from laundry detergent to Legos," the tech titan says -- you can also have a personalized shopping experience by linking your existing Walmart account with Google.