Musa Publishing is starting Club Euterpe! If you join, you will get to read select Euterpe books (in ebook form) before they're released for free! In exchange, Euterpe asks that you simply spread word about the book however you can (i.e. leave a review, post about it on FB/Twitter, recommend it to your friends).
Euterpe prefers that applicants be between ages 8 and 21 (members will be sent age appropriate books). Parents are welcome to apply on behalf of younger children.