This Plymouth sign was one of several offered for sale for $21 by RPM over the last couple months, including "Mopar," "Dodge," "Dodge Dart / Drive" and "Demon." I know his current thread on the Mopar "M" signs is still alive so you should be able to grab one of those if you're inclined. (He's shipped five of them to me direct to save you guys money too -- Scott's a great guy to work with.)
I'm sure if there's enough interest, Scott's buddy could probably be talked into doing some more of the earlier runs. I know I'd be happy to coat more of them however you like. (If they arrive by May 31, they'll also qualify for this month's 15% off Anniversary Special.)
