Read post above ^^^
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Once jail broken, we have an add-in that will create collections on the Kindle from Calibre.
Also, you can add KOreader, which supports many more book file formats than a stock Kindle.
The PW3, a three year old model Kindle, is still the best value for the price.
Even Amazon claims that is its best selling model, and I don't buy that many of them.
(This isn't a Facebook trending scam.)
Also consider the "refurbished" PW3 devices you can purchase through Amazon.
I don't recall any complaints about those and you might save a few bucks.