If memory serves, A-B used to have CDs of those commercials for sale in their online store.
However, when I looked for them a few weeks ago, I couldn't find them anymore. That's when I discovered the site with all of the MP3s.
At any rate, if the price had been what I consider reasonable (highly unlikely), I was ready to buy the ads on CD(s). So, I can't really blame A-B for wanting to protect their copyrighted property, especially if people are willing to pay for it.