I was just in DC on Wednesday. Took a trip to the Air & Space out by Dulles. All there was (in terms of GeminiJets) was a new colors Delta 767-300W for $42
Their glass case of models was very misleading
They had quite a few Skymarks models and some other (expensive) wooden models. I loved the museum (spent 3 1/2 hours in there), but was a little disappointed with the store. The Air & Space museum in the National Mall had a little more variety in the store, but the museum itself just isn't as impressive (but their NWA 747 nose section is pretty sweet).