The Division 2 is available for just £2.50/$2.99 right now on the Uplay Store.
The offer is running over the next few days in the UK and US to coincide with The Divison 2's free weekend that got underway today. Access to the entire game has been granted to all on PC - as well as PS4 and Xbox One - and all of your progress will be carried over if you decide to buy the game during the sale or at a later date. I don't expect it to get much cheaper than this, though.
You get the impression that Ubisoft is trying to give the game a bit of a shot in the arm what with the Warlords of New York expansion due for release on 3rd March. This paid DLC sees the action return to the Big Apple - the setting of the first game in the series - as you hunt down a rogue agent.