I'd try ordering them through Borders... they can get almost anything at the best price and they have regular student/teacher discount days and/or you can be on their email list and they send vouchers for you to print off and take in. I know they are a chain store but I've found them to be very good at getting in very obscure books at a reasonable price. Isn't $70US about the same as $120AU anyhow? My mental arithmetic isn't flash LOL