Addicts (2009)

After a fight at a house party a loner drug dealer (Adam) decides to team up with another dealer (Mike) and his girlfriend (Jaz). The three decide to put a monopoly on their local drug market in hopes of leaving Phoenix and setting up shop in California. Which goes well for about a week or two but then they get threatened, unfortunately they don't know who they get threatened by so they decide to kill and extort their biggest competition.