It's difficult to say how much it would have cost you on GOG without knowing which country you're in. The base price (no taxes, no discounts of any kind) is $78.98, you'd need to check out their site to get the exact price. It's definitely cheaper if you own any of the earlier games.I have already bought The witcher 3 ultimate edition on origin for 79.99 us dollars
So Origin seem to be charging slightly more for the "bundle" as GOG are for the two items separately. Not exactly a great deal.
Anyway, if you've already ordered, you're probably stuck with it unless you were to cancel and re-order somewhere else.