The easiest and best way to propagate Drosera regia
is via root cuttings. Any time I transplant a plant I take some of the older roots for cuttings. I put 2 cm long pieces of roots about 1 cm below the surface of a pot loosely filled with long fibered sphagnum. Some growers use covered clear plastic containers and essentially float the roots over some long fibered sphagnum in water like you would do for leaf cuttings. When the new plants have a few leaves about 2 to 3 cm long I transplant them to a peat/sand or peat/perlite mix with a few Osmocote™ pellets per pot to get them going. I do not know why this species is not more readily available as I find them very easy to propagate and grow from root cuttings. It has also been reported they can be reproduced from leaf cuttings floating in water. Leaf cuttings on soil tend to rot too quickly.