Damn, I ended 5-2 with 10 slots(not counting the three in 5-3). You HAVE to farm them at the infinite spots. There is not enough white in the game if you don't farm. Sucks for me. I'm not playing through again.
50,000-Sherlock Holmes vs. Jack the Ripper-Art Lover 80
100,000-Dragon Age II-I Got Your Back 25
150,000-Assassins Creed III-The New Tea Party 40