World of Warcraft®: Complete Collection Sale End Date?

Hi, I’m looking on getting the World of Warcraft®: Complete Collection for a little multiboxing fun, but don’t have all the gold yet to purchase. I see the page here…

https://us.shop.battle.net/en-us/product/wow-complete-collection

… but it doesn’t have an end of sale date. Could you provide one? Many thanks.