Themed or alphabetical collections, such as the QI: A to D 9-disc set, are available, covering multiple series in one collection.
Several listings indicate a comprehensive DVD set collecting the complete Stephen Fry era. buy qi dvd
Based on search results, here are the primary ways to purchase QI DVDs: Themed or alphabetical collections, such as the QI:
The Complete Qi - a to D Stephen Fry & Alan Davies DVD - eBay Themed or alphabetical collections