Not sure where you are located.....
In Germany, there is a "chain" of producers of hearing aids, called "KIND".
Ihr Weg zum Hörschutz - KIND Hörgeräte - Das ganze Leben hören
(Sorry-only available in German)
The produce individual ear plugs with a replaceable "silencer" (5/10/25 db afair).
I paid about 200 Euro (=250 USD) for mine....and they are great!