The very first thing ever sold over the internet was marijuana. In the 1970s, students from Stanford sold weed to students at MIT using ARPANET to arrange the transaction. While the students used the computer network to facilitate the sale, the actual handling of the money was done in person.
The Internet has been a boon for commerce, but back when it was more tape and spinning reel-to-reel machines than a mysterious set of digital tubes, online shopping was a thing of the future.