https://www.sportsmans.com/hunting-...ih-3-9x40mm-rifle-scope-moa-20/p/1705235

seems like a pretty good deal. I know that sightron doesn't offer a lot of plex scopes anymore

Sure they do. They are not in most stores yet. The entire new line of SI G2 scopes are all available in duplex. Both STACs are available in duplex also.
https://sightron.com/collections/s1-series