The Ubisoft store is offering the standard edition of either The Division, Assassin’s Creed: Syndicate, Rainbow Six: Siege, or Far Cry Primal when you purchase (or pre-order) another, participating title. These other games aren’t just from Ubisoft, though. They also include new releases from EA, Bethesda, and SquareEnix, such as Battlefield 1 (which still requires Origin) and Skyrim: Special Edition.
This is interesting for two reasons. First, and most obvious, if you really want one of the four titles and one of the applicable ones, then it might be cheaper than buying them individually (although you should check for sales elsewhere first).
The second point regards how the various publishers are handling Steam’s dominance in the PC space. EA is now even participating their titles, which are not available on Valve’s service, in promotions from stores owned by other competitors. Meanwhile, it seems like Bethesda is happy putting their stock wherever, and they will even discount games by a third or a half if it aligns with a big Steam Sale. Then we get Ubisoft, who has their own store, but also lists on Steam and does fairly good sales there, too.
Anyway, the sale is running until the 27th. As I said earlier, though, be sure that any combination of game that interests you is actually cheaper than their respective sale price at competing stores before buying.