Usually closed shows will have leftover merch online somewhere - Playbill, broadwaymerch.com, Lincoln Center site, etc. Or at Broadway Flea.
For Comet, however, everything sold out pretty quickly because of the huge fanbase and sad demise of the show. By the final performance, a lot of merch was gone. Even a week before it closed, a bunch of stuff (caps, mules) was sold out. Their online merch shop is closed too. At this point, your best bet would be secondhand stuff on eBay or etsy.
Updated On: 6/17/18 at 06:02 AM