In New Guinea, I saw a clump growing wild that must have been a hundred feet tall, and the natives use the split canes to bring water to their villages from far away.
Here in Ca., they are popular landscape plants, but not the exotic varieties. They sell for about 100 dollars each retail for a 15 gallon pot, and 50 or 60 wholesale. I have to buy them all the time, as I haven't the space to grow them. Too bad you live so far from me, I'd rather give you the money to help expand your collection than give it to some mega nursery.
For some reason, the whole grass complex is in vogue right now, I'm not sure why, as they really don't do anything for me, but people want papyrus, bamboo, fountain grass etc...
I do wish I could grow some of the giant bamboo here, though. It's so increadibly usefull as well as pretty.