My two cents: I have all of the anniversary beers and all the Christmas beers (except PiaPT) so I know how difficult it is to track them down. I was lucky and bought most of them through RS.
You need to be prepared to offer up a significant amount of your cellar for Partridge in a Pear Tree - even moreso if you, like me, are going for a 100% barrel-aged vertical. Good luck.
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