The blue finned variety is not as readily available.
Here is a link to Sam Borsteins site about L. caeruleus. 30 years ago when the malawi frenzy started I had some of the white morph with blue fins. I haven't seen these for quite awhile. Maybe someone in the club has them.
This fish, if you were there, was shown when I spoke in November, it could have been ( the one you mention) the Nkhata Bay variety,,,,depending on which exact location color morph you had the one I showed was with a hint of bluish sheen on the upper half of the body (just enough to say its not pure white), the dorsal black stripe is the same as in all the other "Labs".
So, that whitish Lab that was shown was actually from Lions Cove,,,
not in Lions Cove but just south of Lions Cove,,,anything close just gets the same name.(but both Lions Cove and Nkhata Bay are so closely colored it would be hard to differentitiate by most people) The people, native collectors and fish house staff being very simplistic just call them all Lions Cove.
The best looking "Electric Yellow" comes from Mbowe Island, but they are rare there,,,I only photographed one fish from there this year. Lars,my Swedish buddy observed 4 fish.
I think the last count as far as fish easily representing a distinguished fish location from another location, the count was about 5,,,you might consider this count a bit high but I think everyone could spot the difference pretty quick.
There are several yellow's that look almost the same (1) several white with blue (2) some white morphs no blue (3) and the blue morph which the name represents (4) and there is a 5th one which I am trying to get a picture of which is orange (5) AND YES, you heard it here first, ORANGE!
Hopefully next year I will have the picture! Apparently there is a African Cichlid wholesaler in France that has this fish and is breeding it rather than selling them off.(pers.com. Ad Konings, Safaris 2009) So you may end up hearing about it and now you will know that it won't be a crossed fish.
Labidochromis sp."lions cove" (wild fish two weeks after importing them,Aquarium shot)
The picture may be decieveing to some people as the pearly blue spots are a flash reflection, and these are young fish around 3 inches. They look awesome now!
Like most "Elecric yellows" they are more whitish when born and develop their color as they grow and mature.
Hope this helps,,,,a bit
Cheers,Larry