Anything with lowii tends to be extra expensive, and beautiful. I agree that it is overpriced. To me a rooted cutting of regular x briggsiana should be around $80 with the 'Peter D'amato' clone going for maybe $120. It is a nicer clone from what I've seen with richer color.
Has anyone seen an upper from ventricosa x ephippiata yet? Or is the cross too new. Mine is just starting to vine and recently threw a basal.