>>13
Cheap but high-quality CD-Rs (Ritek) are at less than $0.10 per 700 MB disc. That's a penny for 70 MB, or 1/10 of a penny for 7 MB.
Unless you are buying floppies at a rate of lower than $0.0002 per disk (50 floppies for a penny), floppies lose to CD-Rs (which lose to DVD+-Rs at less than $0.40 per 4.7 GB disc).