Let me explain:
Before X3, I never owned Melodyne. I got the X3 upgrade for $149. From that, I got an offer from Melodyne to get Editor for $149. That's a total of $298.
Before I upgraded to X3, buying Melodyne Editor direct from Melodyne would have cost me $399 - That means that I got Melodyne Editor for $100 less than retail and X3 was effectively free!
Thanks Cakewalk and Melodyne!