All of Matlock is available on DVD now. I'm not aware of any plans to release the two-hour and/or two-part episodes as a separate package. You'd have to buy the seasons and just pick out those shows.
in the time Since I Started this thread 4 years ago, I have Purchased Perry Mason Complete Series and the Perry Mason movie Collection in addition to all Matlock Seasons. In the Case of Perry Mason, there are 30 TV Films. with Matlock, I count 21 2 part episodes. As I mentioned in the opening Post, Hallmark Movie Channel showed these as Movies at one point. Has CBS/P thought about doing it with the Matlock episodes as of yet? Or is it prohibitive because they were 2 part episodes as released on the DVD Season sets ?