Bad news is, the DVD sets have been selling less and less per season, resulting in flagging interest from retailers to stock the new set. But the DVD will still be available at the Shout! Factory site beginning January 19, 2010.
TV Shows on DVD here.
I gotta say I'm kinda disappointed that there isn't much support from fans for this DVD. Perhaps we're not as many as we thought we were. ha! ha! But if this is sold directly from Shout!, it will most likely mean a larger profit margin for them as they won't have to deal with retailer commissions. (Either that or they lower retail price.) That means the show may prove to be more profitable for Shout! in the long run, and it would allow them to continue producing the DVDs well into the 6th season.
An interesting tidbit in the news in the link is that bonus material in this DVD set includes commentaries from creator and cast. I'm not sure who the "creator" they got to do commentaries, but I'm betting it's Jeff Stein.
Mr. Belvedere Season 4 DVD will soon be made available at this particular page at Shout! Factory's site. Let's make this the most popular page on Shout's site when the time comes!