I have every Columbo, but some are better than others. I'm in the UK though, are you in the USA? If I copied the DVDs for you not sure if they'd work on your machine - isn't there some crazy kind of difference between European & US players?
Would love to help you out if I can
So sorry about that, I really do hope you can get hold of the two you are looking for. Have you tried E-bay, there's loads of Columbo stuff popping up all the time. Well, good luck,