Read the following context and choose the best option to answer the question.
Context: Just a while ago it seemed like gaming notebooks were only being manufactured by a handful of specialist resellers and were built to spec , not mass produced . The sales were by no means really great but they did produce more mark up 's on each unit than others . I ' m pretty sure everybody would have liked to have had one however could not seriously justify it .
Question: Why were game books hard to come by in years past ?
Options: 
- Manufacturers could n't justify printing or selling any .
 - They sold too quickly .
 - They were made by specialists .
 - None of the above choices .


They were made by specialists .