I got a pair of Etymotic musician's earplugs to wear to concerts last year--they have a flat 15dB reducing filter, so music still sounds good without damaging my hearing. I can swap out those filters for simple plugs, and it's done wonders for my focus at work.
^)$150 is a lot for earplugs, but if you wear them to work, it wouldn't take long to justify. If you wear them to concerts too, it's not bad at all.
If they aren't comfortable enough for you to wear all day, it's not that expensive. I mean, some people pay about that much for a keyboard, and a good desk chair is far more expensive.
That said... thank you for sharing that store! More people should know about musician's earplugs and enjoy live music without tinnitus.
I'll take another look at the in-ear molds.
My biggest gripe is I can't combine it with over the ear stuff for too long cus it presses my glasses against my head too hard.
(This isn't a joke, by the way.)
Edit: forgot my link: https://www.wired.com/2007/09/nasa-approves-a/
I'd definitely look into it if I were you.
I'm only willing to wear them when I'm really desperate for sleep and I'm in a loud place, or to prevent hearing damage. Neither is an everyday occurrence.