It's cheaper to buy the currently discounted Standard Edition of the game and the soundtrack separately compared to purchasing the non-discounted Deluxe Edition. I purchased the Deluxe and i didn't notice the pricing difference until after the fact. I contacted GOG and i am sure they will refund me the difference. I just made this post to bring awareness to the developers and other potential buyers.

P.S. Great game BTW!

*Edit: Price has now been corrected.