Online stock of Cantillon has kind of dried up the last few months, BIAB doesn't have a single 750ml and only has a couple (kriek and rose) 375ml available. Etre has the same problem but with the addition of Belgian Flag 375ml. Hope they haven't been cut off.
I usually trade it one for one with seasonal beers like kbs, black note or parabola (if I'm lucky). But that's international, I suppose if I was based in the US then I'd be looking for 2x of the above.
