FYI, I bought a few fermenters & cubes from Plasdene last year. 30L fermenters were about $18, 60L was $33 and 20L cubes about $9. Taps were 70c each. I'm pretty sure this was inc. GST and it was their regular off the street pricing (although I did have to place an order as they were out of stock - took a week or so). They have an outlet in Preston, may be worth a phone call.
Just for those near Crown worried about the plastic taste: I only gave mine a fairly average wash out with percarb and boiling water and didn't get any noticeable plastic flavours in a very light rice lager (first brew in it).