In the United States, the DVD boxed version has always contained a disc for both Mac and Windows. For at least the past couple of years, the download version is specific to the OS.
I have just checked some online retailers and the boxed versions DO contain discs for both operating systems. What is confusing is that the image used for the download versions is the same as the box version. However, those ads are clear that they are selling a download for a specific OS (Mac or Windows), and you cannot use a download version to install one copy on a Windows machine and one on a Mac (as is allowed with the DVD).
If you are buying from an online retailer, just make sure that you are buying the DVD boxed version.
This information only relates to the United States. It is possible that things are different in other market regions of the world.