@Helix This was exactly the business of a few Linux distro a while back, when people bought CDs and other physical supports. They'd sell the exact same open source packages that you could get from the web, except at the time that wasn't convenient
I know I installed Linux that way, about 15 years ago (SuSE 6.something, to be precise). Working out what you even need, downloading it all over an ISDN-2 line, and then making it work — or go to a store and buy one box with half a dozen CD-ROMs that come with a convenient installer program? I’ll pay at the counter rather than to the phone company, thanks.