There is a very good selection to choose from in the UK.
You can buy a very well specced BMW Approved 530d M Sport, (Nav, Bluetooth, leather, 19" Alloys, Sport Auto with paddles, Visibility package etc etc) late 2008 from a BMW dealer for around 27000 pounds sterling. Add on 2200 Pounds for shipping and insurance. This is the value for GST. In this case, value for GST is NZ$64000! Add GST of NZ$8000 plus handling charges and Certification with a years ticket of around NZ$3000. Total of NZ$75000 for a September 2008 car. If its Diesel, you need a letter from BMW NZ to say emmission complies with EURO4 which will cost another NZ$500, Plus Sat Nav DVD, say around 6 to 800 dollars. All up say NZ$76500. Importing is straight forward, and its the strength of the NZ dollar which makes this a fair buy. My particular car had NZ$18000 worth of extras. Manual gearbox will be around NZ$3000 to $5000 cheaper. Importing is straight forward if you follow the right steps. Hope this helps.