If there are hundreds on amazon then it's unlikely they will sell fast. (if at all)
In my experience the best way would be to group them into authors if possible. You could try your package idea, who knows! Try to use good key words in the title and group them by weighing and working out the p&p so that it doesn't cost too much eg - 4 books at £3 p&p is better than 5 books at £5 p&p (if one books takes you to the next pricing level) hope this makes sense.