One problem I will flag is that I have never seen any car in the junkyard that has a key.

So, if you bought lock cylinder from junkyard you would need to have ability to re-key - especially if you wanted to match your current keys.

Dealer can sell you one that will be keyed per your VIN and will not have the wear a junkyard lock would have on it.

I have bought new ignition lock & key for @ $100 and new trunk lock assy (& key) for @ $200 from dealer and they have worked out fine, but have had door lock apart to install new microswitch.

There have also been some threads here on switching passenger side door lock to diver side, but I do not recall if it turned out to be do-able at the end of the day.