Comedy Capers run line up shows based mostly in pubs, RSAs and sports clubs throughout greater Auckland and Upper North Island. They have a good range of top pro comedians. 

Comedy Gold NZ  produces live stand up comedy shows that focus on bringing 'the laughs' to the smaller centers around the country. Always a great line up of the top pro comics and the best of the on the rise comics from throughout NZ.
 
Comedy Grapevine run a monthly line up show based at the Brew Bar Hurstmere Rd Takapuna featuring a good range of top pro and semi pro comedians and often good guest international comedians. They also run touring shows running throughout New Zealand.
 
Laugh Club runs line up shows throughout New Zealand.  Great range of top pro comedians and rising stars.
 
Laugh Lines is a free monthly line up show based at The Lumsden Freehouse in Newmarket on the first Monday of the month. They have a range of good pros, semi pro and promising rookies. 

Down To Clown is a weekly show 8.30pm Fridays at the Basement Studio Auckland. This has a different host and theme each week. They have themes like joke swap were the comics perform another comics set, Brown comics, Bad Dates, Injuries, Character comedy, and sometimes just weird alternative stuff. At only $5 it is the best value you will get.

Wellington Open Mic Venues. Monday is Raw Meat at The Fringe , Wednesday is The Medicene at VK's, Thursday is Open Mic at VK 's. Also check out The Cavern . Another is  Hard Cases at S&Ms on Cuba St which is from 7pm Thursday.
For more information on these contact VK's via http://www.vkscomedy.co.nz or contact@humorous.co.nz for The Fringe.