I've got 3 Syn. multipunctatus (what I've always seen called the cuckoo) in a tank; I think I paid $15-20 US each for them. Interestingly, they have bred in this tank. The fry get sucked up into an old Whisper 5 filter (other than it's fry-collecting ability, it's a piece of junk) where I regularly find 1-10 little multis swimming around. I like them; nice little fish that coexist with african cichlids quite nicely.
Jim