Your link didn't work, but if possible, I would avoid booking through raileurope. They needlessly mark up tickets for travelers who don't bother doing research.

Based on what KQ321 said above, I would call DB and ask what their pricing is. The voyages-sncf site (parent company of raileurope) is selling the SparNight ("saver" night) tickets for €69 (~$90), including the option to select a bed (referred to as a "berth") in a 3-berth compartment. Unfortunately, it appears the only option is to have tickets mailed to you, which they will only do through the more expensive raileurope site if you want them sent to the US. SparNight is a German term, so I'm assuming it would be available directly through DB.