My dad has some hearing issues himself (too much rock music, so now he has ringing in his ears when things are too loud) and has gone through several pairs of ear plugs looking for good ones. The ones he has now are his favorite so far. He can't remember a brand name, but he found them in a Sports Academy by the hunting section. They're orange and have like a Christmas tree or screw look. Kind of like this: http://www.odec.ca/projects/2006/mcph6m2/earplugs.jpg
A little different, but that's the idea. He says they're comfortable, block out plenty of sound, and they don't fall out when he works out with them in.
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