I got that same e-mail from Marti. I think its a 'last hurrah' of trying to sell the last of the Recognition Guide books.
Last week on Facebook there was a comment from Paul N. that there were no more retail outlets remaining for the sale of the book. Any orders were to go to & through Paul's website, with the added items (certificate, decal) for $140. Apparently he has made arrangements with Kevin Marti as an outlet.
IIRC, the thread said 150 books remain.
I bought my copy a few years ago from one of the Mustang parts dealers, as Paul was very unhappy with me and had told me not ever to contact him, and he would not sell a copy to me- ever.
That's all water over the dam now, and life goes on.
Neil