There are many thousands of contemporary (or as you call them - modern) books available on the Internet free of charge. I am talking about legal ones.
There are also lots of illegal ones. Lust like the one you have found on ebay.
If you are looking for a *particular* book, you will have to buy it for steep price, I am afraid, or you could spend hours prowling dark corners of the net like non-public channels on some IRC servers, torrent sites like the piratebay, various peer to peer (often called p2p) networks and then spend further time reformatting the book so it is suitable for your Reader.
If you set out to find a good contemporary book, ANY BOOK, and you do not insist that it HAS to be Twilight series, or Harry Potter, there are lots of books available.
One small example:
I have found great site called Critters
www.critters.org/
I have registered there and I can download short stories and novels. You "pay" for reading material by submitting critiques for what you read.
Critters is website for authors that seek somebody that would read their stories or books and provide critique so they could improve their work.
You can not get "fresher" books than that ;-)
To my surprise many of those "raw" books were very good.
Another small example.
Try looking in our subforum
https://www.mobileread.com/forums/forumdisplay.php?f=26
This is where I found:
- Three free very contemporary thrillers by Boyd Morrison
https://www.mobileread.com/forums/showthread.php?t=44129
- "Delver Magic" Trilogy - Jeff Inlo's series FREE in 8 different formats
https://www.mobileread.com/forums/showthread.php?t=47003
- free: The Patriot Witch by C.C. Finlay (pdf version only)
https://www.mobileread.com/forums/showthread.php?t=47435
- "Online Novels" - FREE, legal novels available on the Internet
https://www.mobileread.com/forums/showthread.php?t=47004
- Book One of a trilogy, When Women Were Warriors, as a free download from website:
http://www.catherinemwilson.com/free-ebook.html
If you are USA resident there is high chance that your public library is lending electronic books for your Reader.
Instead of going to the library to get paper books you download file for your reader. After certain period (typically 21 days) the file "expires" and is unreadable on your reader - just like when you return the paper book to the library.
Have another look at our wiki
https://wiki.mobileread.com/wiki/EBook_Lending_Libraries