http://www.newegg.com/Product/Produc...82E16858723014
This is $1.98 above your price of $100 but I can recommend the JBL as a great all-round ereader for library books and many other formats including Barnes & Noble / Fictionwise DRM ereader format. You may need to update the firmware to the latest version (16) if the unit ships with an older version -- to be able to read the DRM epub format that Overdrive (the library lending system) uses. I find the AA batteries to be a handy feature and the bulge on the back of the reader makes a nice grip for your left hand!
I also have the Sony Pocket 300 and Touch 600 and like those as well, so if you can find either of these at a knockdown price (because of the release of the newer models), go for it. I got the Pocket 300 on sale at $105 three months ago so it should be available for much less now, especially the refurb units.
If you can have a look at the jetBook screen before making your decision, please do, as it's quite different from e-ink. Not better or worse, just different. You can hop over to the jetBook forum here at MR to read more about the JB and JBL readers, and why owners (like me) love them so much!
https://www.mobileread.com/forums/forumdisplay.php?f=205
If you find that you enjoy borrowing library ebooks, you may be interested in joining the Free Philadelphia Library to expand your choices. It costs just $15 per year for non-Philadephia residents and you can borrow up to 10 items for as long as 21 days at a time. Nice selection of audio books too!
http://freelibrary.lib.overdrive.com...owseeBooks.htm
Hope this helps you find something that suits your needs.