Assassin's Creed IV: Black Flag is outstanding. It's a fantastic game that might just be the best pirate game since Sid Meier first let us live out our buccaneering dreams. The PC version has remained a little stubborn in terms of its price point, but you can currentlky nab a digital PC copy for just £11.68 ($19.99) if you pop on over to Amazon US. I would say, however, that you should try and pick up a console version if possible (PS4 ideally) simply because the Anvil engine seems to suffer a little on PC.
If you're not based in the States, all you have to do is fabricate a US mailing address to get the game key. You can opt for either a Steam or Uplay code, but let's face it, who the hell would ever freely choose the latter?
Cheers to Jas10 for the tip.