You can buy the live plants or seeds very reasonably, on eBay even less than through Amazon. The trees can withstand light frost but not hard freezing. The demand for the trees is high. They do not produce the same aromatic oils that other eucalyptus do. They can be planted as bonsai. They'e outrageous. And that's why you should buy some.
Caution: invites rainbow koalas and they're proper bastards to evict.