I have a good relationship with both the good LFS --they will get a sheet each week with items available...I can tell them to look for whatever: rays, sharks, eels, fish, corals...
If one shows up on their list that I have requested, they'll call and ask if I want them to order it. That way, I'll be ready for the animal, and know how much it will cost...and where it comes from...
By the way, all sorts of odd things show up: black tips, leopard sharks, octos, weird rays, cuttlefish, nautilis (just some of what they showed me before)...you'd be amazed and what pops up from time to time.
So chum up to the LFS and ask them about ordering stuff special.
As for eels (this should be a permanent sticky in the aggressive forum): get Reef Fishes, Vol. One by Scott Michael...best source on moray info.