Within Australia I would contact Chris at Blanco Negro, Redfern, Sydney. He sells Foma film & I'm pretty sure he stocks 8x10. I haven't tried this film in large format but have seen people get good results from it. Think the price is quite reasonable.
Apart from that I think you'll struggle to find many people even stocking 8x10 in Australia, let alone at a good price. Like most others I buy from B&H or Freestyle. Generally find that B&H have better prices and lower shipping.