I find that I (actually my kid) use this brand at ultra high speed lately. It's one of the most expensive shuttlecock out there. As such, I'm looking for a place (mail order is fine, but preferably in U.S.) to buy a high volume (like 50 tubes, possibly more) at a deeper discount. A Google does return some such merchants doing wholesale, though I don't know if they're selling authentic brand, or imitation, and whether the website is safe. Also, when they say a barrel or a lot, how many tubes are there? I could email them also, I suppose... Anyone has any good experience? Alternatively, if anyone has successfully used a close replacement brand that has similar flight characteristics and durability but at a lower price, I'm willing to try also. Thanks.