Earmold Australia are advertising a cheaper version of their Music Earplugs in Australian Bike Magazines instead of the black bit that is effectively and inline speaker they are fitted with a rubber cup that you fit over the top of your own earbud headphones. The big bonus is they are like 1/3 the price of the electronic version.
I haven't heard of Plugz for Lugz doing these yet but I'm sure if you asked them they'd be able to tell you all about them.
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