I have found myself at live concerts without ear-plugs....a trip to the toilet stall can help.

Throw away used commercial plugs, that is why they are packed 100 pair per box. (about $6.00 USD)

Soft cone shaped FEP-03
CE SNR 37 db
Work well, and you can still talk.
Different colors have different db.
Your local contractor supply.

They also have solid foam plugs, that feel like sandpaper.

Sincerely,
Gargoyle

THROW THEM AWAY !

A horrific inner ear, two year, (mastoid bone) fungus infection I trace back to reusing, my own, ear-plugs for up to a week in the middle-east. I never used the same ones for more than a week.