When Ghostbusters: The Video Game Remastered first came out for Switch, the physical version was an exclusive for GameStop. Every once in awhile, we'll see a retailer's exclusivity on a game time out, and then that title will pop up at other retailers. It looks like that might be the case with Ghostbusters: The Video Game Remastered.
Walmart Canada has a listing for the game on their website now, and they have a June 19th, 2020 ship date attached. It also seems this will only be sold through Walmart's website, and not in brick-and-mortar locations. We'll keep an eye out for more Walmart listings for this title in other regions.