At this point, I find that speculating that a Desert female can be fertile without PROOF is merely a desperate plea to keep prices up on what for many may be, or have been, a bad investment. I am sure that some folks have made some money off the gene, but prices are now rapidly and appropriately falling. Rumors will only serve to artificially keep prices afloat.
I hope someone does figure out something that is not more trouble than it is worth, but currently there is ZERO proof of a fertile Desert female.
I would pay a couple of hundred for a female as a interesting pet, and that is about it.