$3.95 for a Cobra snake lapel pin at Dearborn Classics. Kinda hard to tell from the catalog photo, but I think this is the coiled snake logo more often used with Shelby Mustangs and Mustang Cobras.
Ford Cobra Snake Hat /Lapel Pin - Ford Parts
You can always get lapel pins custom made for your club. But I'd be surprised if you could find 'em anywhere for just $1, either as stock or custom item.