Another "favorites" volume is being released on April 28. This time it's for season 5.

http://tvshowsondvd.com/news/Mamas-Family-Mamas-Favorites-Season-5/20776

The episodes included are:
The Really Loud Family
Ladies Choice
Found Money
What a Dump

The sets usually include 6 episodes but this info only mentions these 4.

For this set, I would've chose these 6 episodes:
Baby Talk
The Really Loud Family
What a Dump
Mama Bell
My Phony Valentine
April Fools

I guess everyone has their personal favorites of season 5.

Official press release: http://tvshowsondvd.com/news/Mamas-Family-Mamas-Favorites-Season-5/20923