A couple of favorites:
Steve Weiss MusicColumbus PercussionSome other places that often have competitive pricing:
Taylor MusicChops PercussionWoodwind & BrasswindNo matter who you buy from, be sure to contact a few sellers and ask for quotes. You'll find that you can often get a better price than what's posted on the web site.
If you're considering
Dynasty, you've gotta contact Paul Collins at
The Brass Shop. His primary line of business is brass instrument sales & repair, but he's a
Dynasty percussion dealer as well. The prices he gives me for my school group always beat every other quote I've been given, and usually by a huge margin. (If you've been around enough drum corps shows, you may have seen his mobile repair shop parked by the stadium. He's been doing repairs for drum corps for a long time. Super nice guy, too.)