S.A. Tholin's Primaterre Series has a lot of this. The primary government operates as more or less a corporation, with soldiers having to pay for surgery in the field, with other aspects of corporation states unfolding with the story. The world building is fantastic, as are the characters, who are all well fleshed out and pretty unique from one another. The dialog is pretty funny at times as well, which gives some good comedic relief to an otherwise very dark plot.