I didnt know Amazon had free books>.
I freq buy mine via ebay.... My last purchase was something like 55 James Patternson books for unde $10. They arrive on CD.
and there are many older, out of copyright books u can get for free as well.. just do a google for " free ebooks".
I love it... I have vision problems and I cna make the font bigger. Makes it much easier to read for me.
I have the Sony version of the Kindle..... DH got it for me last year.....