I don;t know if they are really for sale much anymore. At least not the Rhapis. There was a dedicated variegated Rhapis nursery in Texas which closed its doors.
I bought my variegated Christmas palm from Top Tropicals in Ft Myers. But I am pretty sure they are sold out.
True variegated palms are pretty rare. The Christmas palm comes true from seed 90+ % of the time, which is unusual...usually the variegation is not passed through seed, or the seed is sterile
