Marc,
I'd be very careful there. The albinistic micrathums are mostly very slow growing, if they grow at all. The problem will not be finding an expensive plant, but to find a piece that you can successfully grow over time. I've seen quite a few skillful grows over the years giving up on white micranthum.
My advive as a starting point would be: buy 10 normal micrathums as a trail and see if you can manage these. If they do fine, AND FLOWER well for you, I'd consider the albino.