Drum Resources at Excelsior has them. Actually, any of those cheap earplugs people use for swimming works fine too. And yeah like shred5 said, you should also be able to find earplugs at hardware shops.
Bt y do u guys need earplugs for?? Jamming? Wth..ye must b kiddin me. Earplugs r for extreme circumstances like on the runway of an airport or a very big gig with lots of amps n PAs if ur performing.