If you need whites scraps for crafting purposes, there's an easy method to get a full inventory of whites every 2 runs. It goes this way:
1) Create a game in Act V, quest 8 (Angel of death), any step
2) Initiate Kormac's quest (the templar)
3) Loot every weapon rack and armor spot until the meeting with the high templar
4) Leave game, repeat
You'll get ~100 scraps for every run. Enjoy!
IMPORTANT NOTE: Don't complete the templar quest!