Where to get very rare mammillaria's

Hello.
I'm a farmer in Republic of Korea.
Yesterday, I found gorgous plants at google.
I tried to find where sell these species.
These are mammillaria sanchez-mejoradae f. aurea and mammillaria lutheyi f. aurea.
Rarecacti.com registered these species, unfortunately these aren't now.
If anyone know about that, please help me.
Thank you.

These are cultivars, probably grafted also to provide food for these chlorophyll deficient plants. I've never seen these before, and frankly don't really want to see them again!
Rudy who owns rarecacti.com is someone I know well, and he does like these "sports", which I am aware command quite high prices. I just like to grow natural plants not these.

Thanks for your advice.
But it is very sad that I can not get those plants.