I've bought cable and hydraulic stuff from Venhill before. But I prefer to buy from an Australian supplier to reduce postage cost and delivery time. And I like to support our local Aussie suppliers. I'd not come across Blue Dog before, so Darren's post was helpful.
Being an old fart, I remember the good old days when you could go into a motorcycle shop and they'd sell you cable inners and outers by the metre (actually it was probably by the foot back then), as well as all the ferrules, nipples, adjusters, etc. If anyone has been to Modak in Melbourne you'll know the sort of place I mean.