NEW:
I am unfortunately forced to reduce the size of my collection of plants. For most of the plants on this list, it's a one time opportunity, if you want a particular plant it's now you will have to buy it:

Cactus for "heated greenhouse".
Cactus for unheated greenhouse.
Yucca for garden and the unheated greenhouse
Opuntia for unheated greenhouse and garden. No cuttings available, please try other sources.