dearth = shortage, lack of availability. So if the OP had been on the fence leaning towards a 650 and was not able to get one he/she may have had time to look at the Kindle and decide that it would work for him.
One of these days you are going to accept that the Sony is not the perfect e-reader for everyone. It is great that it works so well for you but the K3 works just as well for many folks. If the OP is happy with his K3 then good for him/her.
ETA: The exact definition according to Merriam Websters website.
Definition of DEARTH
1: scarcity that makes dear; specifically : famine
2: an inadequate supply : lack <a dearth of evidence>
See dearth defined for English-language learners »
Examples of DEARTH
<there was a dearth of usable firewood at the campsite>
<the dearth of salesclerks at the shoe store annoyed us>
It may also be a respite for booksellers, who have been grumbling for several years about sluggish sales and a dearth of dependable blockbuster fiction. —Julie Bosman, New York Times, 19 Oct. 2006
Earnhardt has recently hinted that a company-wide dearth of talent is the core reason his Chevy simply isn't as fast in 2005 as it's been in the past. —Lars Anderson, Sports Illustrated, 11 Apr. 2006
AirNet, which hauls bank checks and other time-critical freight, used to require that its pilots have at least 1,200 hours of flight experience. Then, faced with a dearth of experienced applicants, it dropped the requirement to 500 hours. Now, it has no minimum. —Scott McCartney, Wall Street Journal, 10 Aug. 2000
Origin of DEARTH
Middle English derthe, from Old English *dierth, from dēore dear
First Known Use: 13th century