Ariocarpus retusus var. furfuraceus 'rostratus'

Ariocarpus retusus var. furfuraceus 'rostratus' is a very uncommon plant. These are 5 year old plants that look very healthy. These plants are around 2cm in size across, root is much larger. They have tuberous roots and are getting some growth. Normally a large plant would cost some serious money so these are small and priced I hope accordingly.
 
These are probably zone 7b at best.