There’s been Hirsch and old kirks that have been Willett juice and those have been in seen as low as $100.This is 100% rumor (and not one I'd trust at all). Barrell sources their liquid from all over the world, and Willett (until somewhat recently) wasn't even distilling their own. They list the State/s of distillation on the bottles as well. I have selected a number of Barrell's private selections myself, and never once caught any of the signature Willett notes in them (nor do I believe Barrell would have 6-8 Willett distillate for sale for under $99). Food for thought!
Also here’s ADHD doing a blind of a barrel pick where he discusses this…