Media Law textbook

I want to buy a copy of the Media Law in New Zealand textbook by John Burrows and Ursula Cheer,

Can anyone advise me what the latest edition is, and more importantlywhere one can easily purchase a copy? I’ve searched online with no success.

Also wish to purchase a copy of Steven Price’s Media Minefield. NZJTO list it for sale but you have to send off a postal order and cheque. I want to just order online and pay by credit card or transfer into a bank account. Happy to buy a second hand one.