I picked up these collections for $1.80-$2.20 each (Amazon/Comixology cross-purchase):
Darth Vader: Dark Lord of the Sith Vol. 1: Imperial Machine
The Mighty Thor Vol. 4: The War Thor
Gwenpool, The Unbelievable Vol. 4: Beyond The Fourth Wall
Doctor Strange and the Sorcerers Supreme Vol. 2: Time After Time
If you've never read it, the Star Wars Dark Times story is great: Star Wars Omnibus: Dark Times Vol. 1 and 2 are $4 each (approx. 400 pages a volume).
