Jacques-
We looked casually for over a year to find our '88... Learned via discussions and dealers that 25's are among most popular due to tow-ability and living space. Lots of 29' to 34' trailers always on market, often for no more $$ than 25's..
We found ours on
www.airstream.net site in Texas, after pondering others on similar web sites and RVTrader.com. I think good advice is to have funds all lined up, e-mail version of purchase agreement terms ready (with refund remedy ready if it turns out to be negative surprise..) and be prepared to discuss, evaluate and close (with wire transfer or Paypal funding..) in 72 hours or less. Very few will remain on market longer than a week, unless they're really overpriced. There are occasionally some listed in WBCCI classsifieds (web site or Blue Beret magazine) but not very often, and none currently. Toscano RV in Los Banos CA listed a '99 25' Safari at $20K if you're interested in a Safari..
John McG