Season 3 episodes of Longmire are available to stream for free online at SideReel.com. The episodes are also available for purchase through the iTunes store for $2.99 per episode, as of April 2015.
The full third season of Longmire is available for purchase on iTunes for $25.99. The first and second seasons are also available for purchase.
Longmire was produced by A&E for three seasons and then abruptly cancelled. Netflix bought the production rights and a ten episode fourth season was contracted to stream on Netflix in 2015 in Canada, the United States, Australia and New Zealand. As of 2015, Netflix allows subscribers to stream the first two seasons of Longmire.