I was a little surprised that IMDb has purchase-link sponsorships to twec.com and Best Buy-- as opposed to Amazon.com, which, last I heard, owned IMDb. There are still prominent to-buy links to Amazon on the movie details pages, but the content on the front page has "buy" links to other stores. Certainly IMDb has been making moves to be more profitable in its own right, but I can't imagine a situation where signing on another store would be more cost-effective...