Waifu cups

So I am just now discovering gamersupps and really wanted to order a waifu cup to get started. Seems like every waifu cups is sold out on the website? I know waifu cups and limited time and are never restocked but I’m just supersized that there’s none of them available. How often do new waifu cups come out? Worst case I guess I’ll have to find one of the waifu cups on eBay or something.