I had this guy match the Jetta ignition key to run the doors and trunk lock from just that key.

Very reasonable.

http://www.thesamba.com/vw/forum/viewtopic.php?t=212848

Pretty easy to do, I watched the local VW wrench key everything the same on a beater golf in less than 5 minutes with a hand grinder....and 4-1/2 of those minutes were taking the tumblers out and replacing them.