So far got a lowest quote of $486 from Locksmart. Seems a ripoff, for about an hours work and a little electronic thing.

Anyone suggest any other that might be cheaper? 

Our previous car was the same  as this one  , when I rote it off   we still had one key , identical to the new cars key but apparently this key cannot be reprogrammed  ( I tried a few places ).

Best plan is to wait untill you loose the remaining key and then claim insurance  ......big job as car will need to be towed to w/shop  for re-keying , est about 1500 bucks ... best hope you loose it somewhere not to inconvenient .

For $250 from a bloke in West Auckland, ads on Trademe under Quickfix. Phone 021 0260 4688. 

Good service and much cheaper than - Mitusbishi agent $532 - 2 locksmiths cheapest $480 - they are ripping customers off.

On the evening of New Years Day we had a callout at 10pm. A guy had got himself stranded by the tide on Mahurangi Island and had called some mates who had called coastguard asking for assistance.  We zipped over from Stanmore Bay in the CG Sealegs and picked him up.  The wheels came in handy as we could drive the bow wheel up onto the rocks a little so he didn't have to get too wet.  We got him back to Waiwera where his car was (he was a nice guy - using his phone to translate, lots of selfies and obvious thanks etc.).

Anyway - he had a Lexus hybrid and the key was stuffed so he couldn't unlock the car. Luckily we had screwdrivers small enough to pull his proximity thing apart and get his manual key out HOWEVER this just meant he could get into the car but not start it!  He had to call some mates to come out with a spare key (it was a warm night so we left him to it - he was dry and could get into his car).

Looking at the inside of his proximity key I would say it had been in salt water a few times.