When does entouage season 4 come to DVD?

Entourage ended in 2011 with Season 8, not Season 4. There is no Season 4 on DVD, and there is no Season 4 because the show ended after 8 seasons.

It seems you may be looking for information about the Entourage movie, released in 2015.

If you're interested in getting the Entourage series or movie on DVD, you can find them at most online retailers such as Amazon, Target, or Walmart.