The 21" version is $2500 and the 17" version is $1800. Yes, they can be used as a screen replacement. My eagerly awaited unit is supposidly the 21UX. Sweeeeeeeet!
Great images. Here's another link. 21 Pictures to restore your faith in humanity. http://www.buzzfeed.com/expresident/pictures-that-will-restore-your-faith-in-humanity
In case you guys haven't watched Stephen Colbert on this subject... http://www.colbertnation.com/the-colbert-report-videos/281867/april-21-2010/the-word---no-problemo