It's been available for pre-order at S@H for some time: http://shop.lego.com/product.asp?p=10143 - Americans can even get a discount
($269) if you order before the end of the month.
"The ultimate power in the universe is now the ultimate LEGO set! Death Star II, seen orbiting the forest moon of Endor in Return of the Jedi, has been faithfully reproduced in LEGO form, detailed out with over 3,400 pieces. With included display (...) (19 years ago, 4-Jun-05, to lugnet.starwars)
