I’m seeing this too, never seen such limited inventory. I did notice that If I sorted looking for Champagne, there were only a few options. But when I searched specifically for Billercart’s Cuvee Nicolas Francois, it popped up as available despite not showing previously. Same with Krug.
2012 Force Majeure Series II $29.99
2012 Force Majeure Series IV $34.99
Nicely discounted from release pricing. I loaded up on these a few years ago when I had a 20% promo code and have dug each and every bottle opened since.
It’s showing up on Citi / Mastercard Merchant Offers too, but those can be less reliable. Those do allow offers to be loaded on multiple cards though, unlike Amex which limits it to one per login, usually.