TVShowsonDVD recently just posted on their facebook that "SpongeBob SquarePants - The Next 100 Episodes" will be released on June 4th, 2019 to celebrate 20 years. This will be a sequel DVD to "The First 100 Episodes" from 2009 which had Seasons 1 to 5 on it. This DVD will contain Seasons 6 to 9. Description from their page:
What's funnier than the first 100 episodes of SpongeBob SquarePants? The NEXT 100 (and 4) episodes of SpongeBob SquarePants! Grab a hook down to Bikini Bottom to relive all the F.U.N. in this 16-disc collection bubbling with nautical nonsense from the sixth, seventh, eighth and ninth seasons of the hit Nickelodeon series. You'll ride a tidal wave of laughter through these fan-favorite legends of the deep, including "SpongeBob You're Fired," "It Came from Goo Lagoon," and "MermaidmanBegins." So grab your floaties and jump in -the water's fine! Fan favorite collection timed to celebrate SpongeBob SquarePants 20th anniversary!"
Low quality cover: