I have noticed since first getting in to collecting minis back 5 or 6 years ago that many of the plastic sets once common have become impossible to find at any price. Lots of important sets too such as the Zvezda Old Guard Grenadiers, the Strelets Allied Command and 1st Napoleon and staff sets and even Waterloo 1815 French foot dragoons or Zvezda Guard Cossacks. For a time you couldn't find their French Artillery either which has no equal at least in plastics.
Sure, there are metal 20mm but they are seemingly getting fewer and farther between as well. It troubles me as it seems to be a quick dropping off of all available sets with very little new work coming out, but French units in particular. I don't see that same issue with other scales, perhaps I am wrong but 28 mm always has nice new sets coming out but I'm less sure of 15 mm.
All credit to Massimo of Franznap and Strelets for their excellent new releases but it's the gradual disappearance of the not just the sets but manufacturers too.
Makes me feel like I got in to the hobby just barely in time to snag all those aforementioned sets and others before they disappeared forever. Treasure your 20mm as they will become more and more a rarity as time goes on. Other scales are more popular for gaming and so it goes. Going, going, how long before it really is gone? I do have a longing to have returned to modelling back in it's heyday of the early 2000's. Must've been an exciting time for the hobby. I suppose it reached a crescendo for the 200th anniversary of Waterloo in 2015 and I missed it. Timeliness has never been one of my attributes, ah well.
Cheers,
Bessiere