That's pretty reasonable. Printed shop manuals for my tractors/combine run into the thousands of dollars. I always make sure to get a .pdf thrown into the purchase deal, as even those can get into 4 digits. Of course an average repair by the dealer also runs into the thousands. Would a Triumph dealer even change your oil for $104?
I downloaded the rocket manual, and whenever i need a section i print it, 3 hole punch it, and put it into the binder in the correct order. $104 for a nice pre-made one....ill have to add one on my next parts order. Which hopefully will be no time soon....