Here are a few sites that sell decent ear plugs/hearing protection;
www.cabelas.com www.uscav.com www.policehq.com www.cheaperthandirt.com www.actiongear.com www.gandermountain.com www.midwayusa.com www.nra.org www.galls.com .
There are many styles & brands you could buy. I'd start with milspec/GI type plugs(UScav.com) then upgrade to the Wolf Ears, electronic muffs.
Clyde