Well if you buy it via download then you'll get it instantly and you can always make your own disc for it...
Just download the Lightroom 6/CC offline installers and burn your DVD.
Those linked files also serve as the free trial versions, and convert to the full releases with purchase.
Hope that helps!
Thanks for the quick reply. The link you gave me looks like the CC version. How does it usually work when I download the application? Will I get an email with my activation key?
Will I get an email with my activation key?
Yes. Adobe calls it a serial number.
Actually, the Lightroom 6 version is the same program file as the Lightroom CC version, though there are some differences in the final products... This article explains more:
And yes, if you decide to purchase LR6 instead of subscribing to CC, then Adobe will email you the serial number to activate your standalone license.