Mutisia decurrens

Hi all, I have an area in the garden (against a shed), where I am looking to grow a climber. Already have a few clematis and honeysuckle's, now looking for something a little different. I have my eye on a Mutisia decurrens, but really struggling to locate a young plant!

Any ideas where I could try?

Or any suggestions on another interesting climber?

Well drained soil, in full sunlight and fairly sheltered.

Many thanks