The diligent hobbit has reported on the Evening Post's offering:
"The LOTR posters are now available from Wellington Newspapers and Evening Post offices. They cost $2 plus postage, and the phone number for the EP is (04) 4740444, fax is (04) 4740237. Or people could write to them at PO Box 3740 Wellington, or even go to their
offices at Press House, 40 Boulcott Street, Wellington."

OK, well so it's over to you. Phone, fax or post. Add +64 for the NZ country code if you're trying this from outside. Nice glossy posters of things like Edoras, on quality A2 paper which I've been informed is at least 4 times as big as a normal sheet of paper.