The Triumph dealer in Saugus has a franchise to sell Epco Stainless pipes. I got mine there in less than a week, and it was the first pair they sold.
The Epcos have a nice snappy "real Triumph" sound, loud enough to set off a few car alarms. I haven't been stopped in the 2 years + that I've had them, so I guess they aren't too loud. Another nice thing, being made of stainless steel, they require a lot less maintenance.