As it has been known to do for recent Apple product launches, Walmart announced last week that it would be offering a $20 discount on Apple’s new entry-level 16GB iPad Air starting as soon as the device launches tomorrow on November 1. Now, on launch day of the device in the US, we’ve confirmed that both Apple and Best Buy will be price matching the $479 deal in at least its retail stores. Staples has also decided to join in the day-one iPad Air discount and is currently listing the $479 price point on its website

RadioShack let us know that it will be offering the new iPad Air starting tomorrow alongside increase trade-in values for old iPads and the new $299 iPad mini price point. It won’t be matching the $479 deal however, and instead will sell the Air for Apple’s suggested $499.

While most Apple Stores in the U.S. are expected to have a significant amount of supply for tomorrow morning, we’ve discovered that Apple will be holding back a certain amount of inventory in at least some stores to ensure enough stock for personal pick-up and customers arriving to the store in the afternoon.

Apple and Best Buy are still charging the suggested $499 price tag for the entry iPad Air through their online stores, so you’ll have to head to a physical retail location for the $20 discount. Typically, Apple and Best Buy stores will require you to show proof of the lower price from a retailer that’s eligible for price matching, in this case Walmart. Walmart’s announcement or an ad should suffice.

Following a launch of the iPad Air in Australia, Hong Kong and many other countries yesterday, the device is currently shipping in some countries, such as Australia, within 24 hours, and sold out in others such as Hong Kong. In the US, all models of the device are listed as shipping by November 4th.

Update: Commenters are letting us know that some Apple locations aren’t honoring the discount so we’re advising readers to go to Staples, Best Buy, Walmart or Target if they get turned down at Apple.