I used to buy their shareware game diskettes (in Germany). They were in smallish colorful paper packaging, hanging in displays a bit like Lego polybags today, and they were everywhere. In every supermarket, in paper shops etc.

Data Becker also had lots of serious software, shareware and full versions. There were shelves full of it in electronics markets.

Also, some of the best PC books for amateurs were from Data Becker. I got one for Christmas that explained everything, from the hardware components to using MS DOS.