I wished I had purchased the First Edition Trezor, in 2013 - the ones with the metal enclosure...

Are you sure? They cost 3 times as much as the plastic ones (3 BTC, I think). It was more of a donation to the project.
OK, dug it up in
this video on Feb 20 at 23 minutes in Alena Vranova clearly states that Trezor will be selling last 20 metal cased Trezors next week, says if you are interested subscribe to buytrezor.com/newsletter. That was a month ago still have not heard any more news. I would certainly buy one as a collectible, there will not be any more. Guess they changed their minds.
I confirm, we've been waiting for some deliveries and setting up the bundle now in the eshop, it will go live within these days.