Hi there.
From what I heard was that Tbone (a Danish company I think) went tits up last year. You should check on it before you dish out any lump sum of money to someone claiming to be selling those as it is expensive.
Another option for you could be a headset with custom made earplugs made by Phonak
FreeCom 7000 Pilot Headset
This is a company that has been making hearing aids for some 60 odd years so they should know their way around the human ear.
But it is quite expensive to buy and has some process to it. I think around 8 weeks from start to finish but a better protection for your ears is hard to find.
Note: I do not have any affiliation to that company. It was recommended to me by a hearing specialist which is studying what the effects of cockpit noise is having to our hearing as pilots.