To OP's point I don't have anything to add from Wyeast's availability but people who like the Unibroue strain tend to love it deeply and you could probably find somebody who has some slurry they could share. If not here, maybe on one of the facebook homebrewing groups or HBT.
All the more reason why I find it strange that none of the yeast labs (including the new upstarts like giga/omega/yeast bay/etc.) seem to offer this as a year-round strain.
When I use it, I try to start with a low-gravity beer and bottle condition at least part of the batch. I've been successful at stepping it back up off of my own bottle dregs as old as the 2-year old ballpark.
Great information! I'm glad to hear that. I reached out to The Imperial guys. I was shocked that they called me on the phone. They don't carry that strain, but he also asked about stepping from a bottle. When I brewed my Triple I had filled a few glass gallon jugs for a friend to take on a hunting trip. Talking to him last night about not having that yeast. He said he brought back one jug, and that they never cracked it open. It has been refrigerated the entire time. I picked it up last night and there is plenty of yeast in the jug. I brewed it in late October. Hopefully it will take off. I will brew something low gravity to build me a stash it it is viable. 3864 is hands down, my favorite Belgian strain.
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