I have no idea how they are quality wise but i would be wary as i doubt they are official, some are top quality, some are unwatchable. Have never shopped there so have also no idea if they actually stock them either.
Mirry- I checked my library for Columbo DVDs, and they had the complete first season. I don't remember who the distributor was, but the quality was excellent. So,you may want to check your library.