They never released season seven on BD across the pond?!?!
Edit: I found it on Amazon UK -
https://www.amazon.co.uk/Venture-Bros-Complete-Seventh-Blu-ray/dp/B07PMLWXZC/ref=sr_1_10?dchild=1&keywords=Venture+Bros.&qid=1623271908&sr=8-10
Here is the real petition
Where have you been looking?
amazon
target