I do not know if Trijicon is producing any more Type 1 RMRs. I wouldn't think they'd still be making them - but I'll see big sales on them a few times a year so it makes me wonder just how big the extant supply is.
Things to keep in mind: The Type 1 wasn't ever designed / meant / intended to be mounted on a reciprocating pistol slide. A good deal of them have been mounted this way... Which lead to the discovery that the battery leads on the interior weren't quite up to snuff. And that lead to the development of the anti-flicker plate that slightly elevates the battery so it makes better contact.
The Type 2 was, apparently, designed to be more robust in it's most prevalent usage - mounted to a pistol slide. If you're patient and follow the right social media accounts, you can find some of them just under $400.
Then it'll be about a minimum of $125 to have a slide milled should it need done.
Thanks TF! Good to know. I will need to do some more homework. If I'm going to buy something to replace a Vortex Venom that I have on my .22, I want to be sure it's up to the task of repeated use on my 9 mm.