I also have the book, A High Art by Reubem Fonseca. Very different than the movie. It was pretty hard to find and I had to wait a couple of years for it to show up on Amazon. I don't think it was too expensive but I probably won't loan it out lol... there are a bunch from that famous online book place ranging from $4-$100. There are some used VHS copies of the movie as well...
In the movie the knife that the main bad guy used to carve the face of the hookers was a custom.
In the book one of the knives described was a "Cassidy with a fourteen centimeter blade and a black micarta handle" but the plot was very different from the movie.
In the movie when Rafael the assassin uses the Spyderco Police, in the book he uses "an ordinary Tramontina purchased in a cutlery shop on Praca Tiradentes" later described as a "...Tramontina, it's a kitchen knife you can buy anywhere." Camilo Fuentes, the big Indian, mainly used a machete. Mandrake used the Randall, Hermes used a Randall as well I believe but I can't remember. It has been a couple of years since I read the book.