They are tricky to come by, and a bit sporadic.
I breed ptyochromis hippo point salmon and astatotilapia aeneocolor yellow belly alberts ( not strictly a Victorian, I think).
Apart from latifasciata, I have seen enterochromis paropius, a peaceful and very pretty fish. There are some python island pundamilia nyereri about, as well as haplochromis sp.44 "thickskin. Also some haplochromis thereuterion and a few lithocromis types if you can track them down. Egyptian mouthbrooders ( pseudocrenilabrus multicolor) might even qualify.
These and others are floating about at sponsor stores and in breeders'collections, but not a great many. Have seen them at Aquotix, Vebas, Rob's, Morley, Midland . The main point is if you have more than one species of Victorian, don't keep them in the same tank (unless it's an all male display), as the females resemble each other pretty closely and the fry are pretty much indistinguishable.