It looks like the life of the UCS 10188 LEGO Star Wars Death Star is approaching its final days. Released back in 2008, the set has been available for sale in the market for 7 years. Today, the Death Star has been listed at LEGO Shop at Home as “Call to check product availability”. This status usually pops up when LEGO has very few quantities available so you will have to call them to place an order.
Thanks to John for writing in.