# Monitoring Price Fluctuations of Book Trade-In Values on Amazon

I collected a few books I was willing to part with and set up a scraper in R. I am primarily interested in selling my books to Amazon, so I tracked Amazon’s Trade-In prices for these books. This was done fairly easily with Hadley Wickham’s package rvest and the Chrome extension Selector Gadget. Selector Gadget tells me that the node I’m interested in is #tradeInButton_tradeInValue. The code to do the scraping is below.