Cubase 4,5 to 6 upgrade...

Is this upgrade only available for purchase here online? I’ve called two national music places I deal with (specifically Guitar Center and Sweetwater) and neither of them knew anything about an upgrade being offered. I was given a gift card to GC and was hoping to be able to use it to by the upgrade locally, but it appears I can 't…Is that the case?

Correct. Online only for upgrades.

Upgrades (from studio 4/5) & updates from version 4/5 are also available in the stores (at least in europe).