Because the Adult Swim Shop closed in 2012, you must look for pre-owned copies from independent sellers or specialty collectors:
Sites like SloppySecondSales and Wormboy Exclusives sell fan-made, region-free Blu-Ray sets that often include Season 3 and the "Invictus" special, which were not part of the original 2008 DVD release. 12 oz mouse dvd buy
The series is available for digital purchase on platforms like Google Play and Apple TV . Because the Adult Swim Shop closed in 2012,
: Occasionally listed by third-party sellers like Achilles' Reel. 12 oz mouse dvd buy
If you cannot find an original DVD, there are other ways to own the series: