You can get them at the marine center, and atlantis aquarium and reef science both have gotten them in before.
If i was going to suggest where to get it, I'd say Marine Center, even though you'll pay a lot more, its guaranteed for a certain number of days, and they say they keep them until they are eating right, etc. THe reason Bellus' are hard to keep is because they are from deep water, and therefore have the risk of not being acclimated properly from those higher pressure areas.