I have been watching the motorhome prices for Airstreams specifically now for a year and a half. The trend is upward, as I have seen over this period. In recent ads the average price of a pre-1988 model Classic, under 32 feet was $22,700. Most of these were the 81-83 models in the groups I followed.
Pricing for the 34.5 is all over the place running as high as $39,000 and as low as $22,700.
These are asking prices of course, but since the trend is up, and the supply is short it looks like a good future for the only rig of its kind on the road. Should make all of us feel like our hard work on maintenance is well justified!!