Exact, Yves makes very small series, from a few to maximum 100 and sells or give to close friends, from his club, or if a few more, to some people such a during show at Lille or Ransart (Belgium). Only few are commercialized, for the most, I even could not put my hand on them, although close to the Canonniers ....
It is a choice of the author ! One was for example given to the participants of the competition organized in his club last year to reward registration of pieces...
Best is to know him personally for some of them still in his own inventory. They are all mane od resin 5 mm thickness.