Where to buy immobiliser key and remote ( not Nissan )

Hi All. In follow on from my problem of 42TD S3 not starting ( under the general forum me thinks ) - it was a fault in the key not de-activating the immobiliser. The alternate key works just fine.

Does anyone know where I can get an immobiliser key from, get it cut and then have it programmed? Nissan wants 1$190 for the key and $120 for the programming. Not bad for 5 minutes work.

Also be interested in picking up the open / close fob and getting this programmed too.

Thanks in advance