I can upgrade Kontakt for $49.50. That's getting low enough to warrant consideration, the previous best offer being $79.
I was looking to see if my Guitar Rig 4 I got from one Sonar or another would qualify me, but it doesn't. I guess you have to have actually spent money with Native Instruments to qualify...
The text says "upgrade for users of ... Guitar Rig 3 LE...Guitar Rig 4 LE". Says "users", not "purchasers". I'd interpret that as meaning as users of GR, even if it came bundled with something else, we should still qualify for the crossgrade price of $49.50.
I'm actually more interested in upgrading GR than Kontakt. Fifty bucks is half the price of Scuffham S-Gear, which I've been eyeing for a long time.