Starline makes .327 Brass once a year. They just did their run around the end of 2014, so you will have to wait until the next run if you reload, and want a bulk amount of brass, for a decent price.
I originally had three Single Seven's on order, one of each barrel length, because Lipsey made it sound like it was going to be a very limited run, and they would be hard to get.
They are the single most available revolver in .327, which makes it less desirable for me. I canceled my order, and am waiting for a Blackhawk or GP100 to come up for a decent price.
That being said, I LOVE the .327 revolvers. They are extremely versatile, I own a Smith 632-2 as well as a Charter Arms Patriot that I got very cheap. For a J-frame, the 632 is just too heavy for me to carry, not to mention the 3" barrel with tall front sight, and adjustable rear sight, are not very good for carrying. I have since switched to a Smith 432PD, which is much, much nicer, and offers a good punch.
If you can get a Single Seven for a good price, or need a quality woods gun (and don't have to defend against Grizzlies), I think the Single Seven in 5.5" would be an awesome choice. I will get one, eventually, it just isn't on my list of "get right now" guns.