When I was hunting for masts a year ago, I saw a couple of used masts of various length and condition on Gumtree. I found nothing to sort my boat out so went through insurance and bought a brand new mast. I did however find a matching bottom half of the same Magnum mast here in Perth which I had planned to splice together as a project when I have more time.
New masts are expensive. My 9.5m Magnum mast cost over $10K (fully rigged). Is your mast broken or lost OB? Perhaps you can cut and splice it back together?
DM