Cass

Hi, I need to replace the driver side lock as the key wont turn in the existing one anymore. Any idea where i can source and original/secondhand VW part? My mechanic had one on order but the order was then cancelled and he couldn't get one from the dealer. I've tried ebay and various other sites but I haven't found any genuine parts, which my mechanic say will be a problem because any imitations will be difficult to fit properly and just wont last. Any help or advice much appreciated.