For anything from long tail priceonomics seems to show pretty much random data, e.g. this is the most most popular amplifier: http://priceonomics.com/amplifiers

For anything from long tail priceonomics seems to show pretty much random data, e.g. this is the most most popular amplifier: http://priceonomics.com/amplifiers/eagle/ http://priceonomics.com/amplifiers/eagle/ (I tried amplifiers because I was curious to compare data with a toy site (500 lines of haskell for crawler+site) I built for audio equipment price trends: http://kruipen.com http://kruipen.com)