They are available every few months through you lfs or Online retailer, but if you looking to put it in a reef tank, i would strongly warn against it, they rip up sps like theres no tomorrow.
drew
When the red sea's are tiny there are usually fine, but I 100% guarantee when they get larger they will pick you sps's to death. We had an idiot at my local fish drop one in the show tank, and we had to remove almost every coral from the tank, and still had to suck the cleaner wrasse into a power head that we had rigged with a piece of pvc. It's your call, but I would avoid the red sea cleaner wrasses. Theres also a black wrasse with a white stripe that looks like a cleaner wrasse, and he'll also eat acros and other corals.
Good luck
drew
Not to be a jerk, but don't start buying fish yet. From your other post, it sounds like your just starting out - you'll hate yourself if you put fish in too soon.
It actually doesn't really look like a cleaner wrasse to me at all. It appears to be shaped more like a false cleaner, something that takes advantage of looking like a cleaner wrasse to get close enough to take some nips out of the cleanee. Just speculating, though, sounds like others are much more familiar with the species than I am.