$130, plus shipping (retail price for one in the same condition: $200)
I bought it last November and used it intensively for a few months until I sent it back to the manufacturer for a repair under warranty. They exchanged it for a brand new device.
This little guy supports Adobe Digital Editions (EPUB and PDF) which means that quite probably you can download books from your library (you'd have to check with them, of course).
A few specs:
5" vizplex screen
Accelerometer (you can turn pages without pressing any button)
Protective cover (I would argue that its size + its protective cover make the PB360 one of the most portable ereaders out there)
Fully customizable keys
E-Book formats: EPUB, FB2, FB2.zip, TXT, PDF, RTF, HTML, PRC (mobipocket), CHM, DJVU, DOC, TCR (DOCX, the new MS Office format works very well, but for some reason the manufacturers don't brag about it)
Image formats: JPEG, BMP, PNG, TIFF
Calendar, Dictionary, Sudoku, Socoban and other games
Comes with warranty card, valid until Nov 14th 2010.
USB cable included.
Here's a review full of user-friendly advice:
https://www.mobileread.com/forums/showthread.php?t=66798