The site listed the e-reader and lighted case as two separate items:
http://www.buchhaus.ch/start/detail/...rz-PRST3BC.CE7
http://www.buchhaus.ch/detail/ISBN-4...-Reader-PRS-T3
It has long been a practice of all the big players to charge an exorbitant price for a mass-produced bit of plastic called a case that costs pennies to make. I can't see Sony giving up the practice.
The increased weight is an interesting fact, but I don't think the price includes a case, lighted or otherwise.