Keep googling, every day.
Put in stock notification requests to Mountain Laurel Designs and Gossamer Gear, both of whom state they're expecting shipments this month. I know that GG takes the requests in order received; I'll bet MLD does too. Check other firms to see if they do backorder requests of some sort.
I got a 2L one from Trail Designs last spring and two 400 ml ones from a place called "Great Outdoors Depot."
The problem is that thanks to the newer Platypus' being incompatible with the Sawyer Squeeze Filter, the Evernew carriers have become highly sought after. That's Platypus' loss for instituting non-standard threads! Plus I understand that the Evernew factory in Japan was out of production for quite a while after the tsunami and is still trying to catch up.