Here's a link to a post from a while ago
http://www.enz.org/forum/showthread.php?t=20237
I did mine around Sept. last year and ended up going with a GP doing the forms and getting bloodwork and xrays at the two walk-in places off papanui road in merivale (near the mcdonalds). I wanted the cheapest method possible. It only took one 1/2hr visit to the docs, then another 1/2 getting xrays and blood at the walk-ins. The walk-ins sent the forms to the doc directly and then I picked everything up from the GP 5 days later.