Where can I buy healthy adenium rootstock?

Hello,

Does anybody know where I can buy healthy ready to graft adenium rootstock? I need it so I have spare rootstock in case one of my adenium plants have rotten caudex this winter. I'm just kind of worried, because this will be the first winter for my adenium & for me (I used to live in Indonesia). I got some from snowbelt adeniums, but they are soft and thin. Any advice will be very appreciated.

Thank you.

If they do rot
Cut off whats good and dry it on a heat pad in dry sand
Treat it with root horemone and fungicide.
That will hold you untill you get root stock
They may also root.