Purchased part 1, 2 weeks ago and now the duo pack is the same price? How can I take advantage of sale?
Unfortunately you can't, it's the nature of sales.
You can try to refund number 1, but chances are it might not be able to be refunded.
Even though it says since I already own part 1 that I can get part 2 at a discount?
In Japan, the price of the discounted pack is more expensive than The Climb 2 by itself if you already own The Climb. Sadly, neither Oculus or Crytek care to address this.