DC's weekly sale is on Frank Miller Batman books; four $6.99 collections and twenty-one $.99 singles until 11/29/15.
The Dark Knight Returns 1-4 and collection
The Dark Knight Strikes Again 1-3 and collection
Batman: Year One (Batman 404-407) and collection
All-Star Batman and Robin, The Boy Wonder 1-10 and collection
https://www.comixology.com/Frank-Miller-Sale/page/8871
From Dynamite, a Garth Ennis sale until 11/27/15 that includes a Jennifer Blood bundle.
https://www.comixology.com/Garth-Ennis-Sale/page/8873
The Boys: three omnibi at $17.99 to $19.99 and 12 collections at $3.99 to $8.99; best option debatable, complex math/bonus content iirc
Battlefields: two omnibi at $7.99 each and six collections at $2.99; both options collecting all issues, but the first option has bonus content and is cheaper
Jennifer Blood: volumes 1-3 at $4.99 each, collecting issues 1-18; and a bundle of issues 1-36 for $24.99
https://www.comixology.com/Jennifer-Blood/bundle/1081