USER NOTE:
I have Bionicle Mask of Light finished, and am finishing Adventures #1. I have both of these files in pdf format. 
If you would like to get these and future books as I finish scanning and saving them, please send me an email at Davidjameseltz@gmail.com . 
I will gladly add you to an mailing list and send you every book as I complete it. 

P.S.- If you are looking to read them all from the start, I had loaned a friend my copy of the first book and just got it back today. 
I'll begin scanning that one tomorrow, and there's a very high chance I can have it ready by the weekend.