Don’t forget little brother VIC-20’s cassette tape storage.
I had one of the first 500 C-64s and there wasn’t a disk available at release, either. I used tape for the first 8 months, IIRC. Considering all the problems I had with the original 1541 disk drive, the tape was a blessing. I think mine was repaired about five times and was once in the shop for three months.