Looks like the sale is back for July 4th. You have to enter your zip code to see if the deal is in effect for your area.
Costco Wholesale has for their Members: GoPro HERO8 Black Action Camera Bundle on sale for $289.99 (+tax). Shipping is free. Thanks morningstar101
Deal Editor's Notes & Price Research: Offer valid through July 5, 2020 or while supplies last
Even w/o Costco membership this deal came out to $332 shipped after tax, which is the price of go pro 8 body-only on Amazon after tax.