Those molded earplugs can also be gotten at gun shows. That's where I got mine, at an SF Cow Palace gun show many years ago.
My tinnitus, is infrequent. Trying to emulate The Who in the 70's was probably the primary cause. Fortunately, my guitar amps were only 200-ish watts. Though there have been plenty other loud noise sources to contribute. And as said, the damage, is cumulative, Drag races, airplanes, chain saws, etc.
I'm fortunate that when I do get episodes, they only last a few minutes now. The longest was 3 days. Which was enough to put the scare into me and be watchful for the future.