I saw a set of ZEM model ear plugs that looked practical. Check the NRA store;
www.nra.org .
A few other brands are out there; Howard Leight, Peltor, etc. USCav.com Cabelas.com & Bass Pro Shops may have a good set of ear muffs or plugs.
UScav sells the milspec/GI type:
www.uscav.com .
Happy Holidays;
ClydeFrog