Social science journals published in NZ are mainly hosted by the various professional associations and include (source: INZ):

Asia Pacific Viewpoint: specialises in the study of development, change and underdevelopment
Australasian Journal of Disaster and Trauma Studies
Communication Journal of New Zealand
Delta

Electronic Journal of Australian and New Zealand History:

http://www.jcu.edu.au/aff/history/
He Pukenga Korero: a journal of Maori studies
J P S: Journal of the Polynesian Society
Journal of New Zealand Studies
Kotuitui: New Zealand journal of social sciences online
Marketing Bulletin (Online Edition)
New Zealand Annual Review of Education
New Zealand Economic Papers
New Zealand Geographer
New Zealand Journal of Asian Studies
New Zealand Journal of Business
New Zealand Journal of Disability Studies
New Zealand Journal of Educational Studies
New Zealand Journal of Employment Relations (Online Ed.)
New Zealand Journal of Geography
New Zealand Journal of History
NZJIR: NZ Journal of Industrial Relations
New Zealand Journal of Media Studies
New Zealand Journal of Psychology
New Zealand Journal of Social Studies
New Zealand Medical Journal (Online Edition)
New Zealand Sociology

Sites
SPJNZ: Social Policy Journal of NZ
WSJ: Womens Studies Journal

NZ Social Science book publishers
Social Science Book Publishing is mainly concentrated with the University Presses and some commercial and monograph publishers:

Auckland University Press
Victoria University Press
Canterbury University Press
Lincoln University Press
Otago University Press
Dunmore Press  http://www.dunmore.co.nz/
NZCER Press http://www.nzcer.org.nz/default.php?cPath=345_139