The fourth season is now on dvd.

Product Details
Actors: Scott Wolf, Neve Campbell, Matthew Fox, Lacey Chabert, Jennifer Love Hewitt
Format: NTSC
Language: English
Region: All Regions
Aspect Ratio: 1.33:1
Number of discs: 5
Rated: NR (Not Rated)
Studio: SPE
DVD Release Date: March 5, 2013
Run Time: 1078 minutes
ASIN: B00BBGZ17O

http://ecx.images-amazon.com/images/I/51rXPD4W%2BHL._SY300_.jpg