Scotch isn't really very trendy
Au contraire, Scotch is very trendy at the moment. Combine this with the amount of people that can afford a more expensive bottle (vs. say 20 years ago) and we are now seeing shortages, especially in the more aged versions.
Whisky lounges are popping up all over the place as well. My guess is, Glenlivet wanted to get that "double barrel" on their label.
I can remember MacCallan 25 for $699/bottle. Now its two grand. Nothing has changed other than it's slightly less available now and more people can, and are willing to, pay that much.
That being said, my 2 regular Scotches are Glendronach 12 year and Benriach 10 year. (I actually prefer the Benriach 10 to the 12.) I order 4-6 bottles of either at a time for around $50/bottle to make sure I always have them on hand. Single bottles are on the shelf for as much as $70 (sometimes less) per.
I'm not quite sure what an American single malt is other than someone trying to specifically produce whisky (not whiskey) in America, in which case there really aren't any as good especially for the price. Anything at the $50-ish/bottle mark had better be good as there are any number of competitors which are. Anything at the $100-ish/bottle mark had better really be something. Tomatin 18 (at $80/bottle) and Bunnahabhain 18 (at $110/bottle) are tough to compete with. Most American anything fails to compete at this level. I'm not sure why so many American producers think their stuff is worth their asking price although a lot of people do pay it.
Also, I will throw a shout out to Nikka for both their Coffey grain and Coffey malt whiskies. Both are great and won't break the bank unlike most other Japanese whiskies, most of which aren't very good or are very expensive.