Comment by christopheraden

I agree it's a barrier to have such crazy prices, but there are free resources available, especially on a topic as popular as Grammar of Graphics. Hadley Wickham (in my mind, synonymous with the concept, since he implemented Wilkinson's ideas in R's ggplot package), for instance, has numerous materials on it, including a short primer (http://vita.had.co.nz/papers/layered-grammar.pdf). It might not be as exhaustive as the Wilkinson text, but surely there's enough material out there to implement GG in JS, especially considering there's successful implementations in other languages?