BLOODY GRAFTING STOCK

Why is Grafting stock so damn difficult to come by?

I often visit local garden centres and few of them sell cacti, the ones that do stock Shit!
I have brought another San Pedro to use as rootstock; from the same trademe seller so I presume they are clones.
I intend to use this for another Peyote graft when its roots have developed!

I would really like to have a grafting stock from many different species so that I can experiment with what works best!
I intend to use:

Hylocereus undatus (dragon fruit)

Myrtillocactus Geometrizans

Stenocereus pruinosus

Trichocereus Spachianus

Any Pilosocereus

pilosocereus azureaus

I brought this thing for dead cheap but I am not sure what it is!





Trichocereus Panchanoi