Is it not outlawed ? I guess it varies from country to country. I know in the UK, in retail bookselling there used to be something called the 'net-book agreement' in which publishers fixed a minimum price for which books could be sold, and this was made illegal. The downside was a lot of book retailers, large (Borders) and small closed down, but we all started buying cheaper books from the supermarket and amazon. Meanwhile it is different in France, and Amazon is subject to more restrictions in order to keep local bookshops profitable. I guess the books are more expensive too in France too (but the wine is a lot cheaper - which would you choose ?

).
Of course, bikes are different, and as this thread has shown, if the day comes when there is no one to set up or fix our bikes that we have bought online then we are all in trouble.