WTT: 13-16 Founder's KBS and Goose Island BCS

I have multiple verticals of the two subject line beers that I would like to trade for beers of similar value. Most specifically, I am looking for sours. Cantillon and Drie Fonteinen are at the top of my list, but please let me know what you’ve got.

I also have a handful of others: Surly Darkness (regular and barrel aged),Goose coffee and rye BCS, etc, but mostly stouts.

Regards,
Andy Kei!!or