Cinnamon Myrtle is popular these days in nurseries so shouldn't be hard to find. Flower Power in Enfield (sydney) had quite a number on special about 5 weeks ago.
Also, Daleys Fruit (Www.daleysfruit.com.au
) stock this plant at times too. They may have some now, i haven't checked.
There is also a Curry Myrtle, but whilst it has a curry fragrance, I am yet to see any documentation that will state it is edible, so therefore if you get this one, be careful of consuming it (Curry myrtle is available from Yuruga Nursery in Queensland - i've bought one from them about 12 months ago on Mail Order).
Which City/State do you live in? I could assist findign a place that may have it if need be.