Paramount Home Entertainment will be releasing "Hey Arnold: the Ultimate Collection" and will be re-releasing "Rocko's Modern Life: the Complete Series" on DVD on November 20. Both shows were originally released on DVD by Shout! Factory as far back as 2011, but those sets have since gone out of print as far as I can tell.
Bonus features for Rocko's Modern Life: the Complete Series:
- “Trash-O-Madness” Original Pilot Version
- Behind the Characters with Joe Murray (x4): Rocko / Heffer / Filburt / The Bigheads
- Commentary by Joe Murray on select episodes
- “Wacky Delly” Live 2012
- Hey Arnold! The Pilot
- Original Claymation Short: Arnold Escapes from Church
- Drawing Arnold!
- The Jungle Movie: Table Read
- Unboxing the Original Jungle Movie Development Art