Free: Contests & Raffles.
Fluting was primarily designed as a raceway for dirt and debris, especially snow and ice, to have a raceway to run into without seizing the bolt. Side benefits are lighter weight (not much) and the cool aesthetics of it.
Where are you seeing a price list?
Thinking about sending my .300 win mag Encore barrel to Kampfeld to be fluted. I talked to him and he said he could do it. Sadly, it doesn't have a bolt I could also get fluted.