If you go to the Pricing tab you'll see links to buy the parts through popular North American and European distributors. This data is supplied via Octopart.
Ah, I completely didn't see that tab... Then perhaps some usability feedback; maybe create links of the already orange text in the upper left hand box (the "Average Price") and have it auto-choose the Pricing tab below and scroll the page there? Make it super easy to find :)