Hi Brendan! I dont know where you can get rhizomes from but you can find seeds in cones sometimes, its a gamble as most seeds turn male I think!
I can send you cascade rhizomes during the winter, not a prob, just remind me mid winter!
Hey, whats that that 70L SS pot off trademe like? I'm still looking at getting the 41L SS one but at that price it kind of looks too good to be true, plus I don't have the money to be burnt (so to speak) so I'd be interested in how your one turned out/goes.