You need a key with a chip for starters, then you need to get it cut. In some instances you may actually need two chip keys for the immobiliser to work.
You may be able to get a key cheaper but the genuine keys are usually around $180, Jeffersons have them on special for $140 odd. Part number UJY3762GX.
https://www.ebay.com.au/itm/23323393...frcectupt=true