Haven't seen those before but you always need to be wary of enhanced photos. And colours can change with different light exposures as well as climates. I bought a Colocasia that was black but now many of the clones I've got from it vary a lot. The ones growing in most sun are the darkest. Still, I wouldn't mind having the one in the photo, even if it changed a few shades.

I bought a plant from Brian's and was pleased with what I got. Plant Delights has a Black Coral that looks similar. Some seasoned tropicals enthusiasts I know of have mentioned the latter place over the years.

Yes, the Ripple one is intriguing me. I saw a posting on Facebook and it does indeed look very dark. I've never ordered from him, but I've heard overall great things, so it cannot hurt to give it a try.

black coral, electric blue gecko ( mini ) and black saphire gecko are all VERY black.

the photo of puckerd up is not enhanced in any way, they look just like that. I have seen that very plant in the photos myself. it is another great plant but not as black as the others