Young guy here (35) but even I bought powder at one point for $10 a pound in the late 90s/early 2000s as a teenager. I wasn't of ample coinage, but I certainly would have tried to stock up more had I known prices would creep up so much. My first pound of powder ever was a can of Goex I found in my dad's shooting supplies (he died when I was 11). Still have the can somewhere (sans powder) and it was probably from the early 80s. I remember thinking that one can, 3/4th full, would last for a long time once I got my hands on my first muzzleloader. Little did I know.
Also, I remember the first can of powder I bought from a local gun store. My mom drove me and the little shop took no time at all to fetch me a can of Goex for $10. When that store went out of business, the Gander Mnt. in town fortunately still carried black powder for a handful of years which was great since I didn't have the money to buy in bulk and have it shipped. The employees were ignorant of muzzleloading. I remember respectfully listening to the gentleman behind the counter lecture me that I didn't need Goex, I should just go over to the shelf and get some Pyrodex (even though they had Goex in the back). This was after a round of young employees told me that all they sold was synthetics. When I politely told him that I would really like to buy a can of Goex because it was for a flintlock he rolled his eyes as if to say, "fine, snot-nosed kid, have it your way." He then asked, "rifle or pistol" because apparently that determined whether he would get me 2f or 3f. I had to practically beg for him to sell me 3f instead of 2f. Eventually they stopped selling black powder too.