On every course I've ever done, including outside of diving, if you lose the course materials after the course then that is your problem in most cases. I don't think it is unreasonable that PADI doesn't just hand out a replacement set every time an ex-student loses theirs. The number of courses I've done where materials were freely available to the public I think is probably zero. I don't really get what you're moaning about. When you do a course you are buying a package of products. Tesco won't give me a new pint of milk for free when I've used the old one. I can't have my tea without milk but I'm not blaming Tesco for that.