While awaiting Paul's response, I just wanted to add that I purchased a Kettler Nena, which has most of the features of the Silverstar, from http://abikestore.com/

It arrived in two-and-a-half weeks in an oversized box, shipped directly from Kettler's factory in Germany. The gears and brakes needed some minor adjustments. Besides that, all that was necessary was to straighten the handlebars and attach the pedals.

I highly recommend this dealer. I believe a Web site called http://giftwarehouse.com also carries Kettlers. They're real works of art, have excellent componentry and are priced competitively with the also-excellent Breezers.