I'm really starting to consider this option. Nonody is willing to maintain Win32 build of python-gammu and it is now far behind current version, with many bugs which were already fixed in source code.
It would need quite a lot of effort from me, because I'm really not experienced with Windows (and I don't like that environment). I could setup cross compiling environment and build Windows version on Linux, but this is something what I'm a bit affraid and need some time.
So if nobody is really interested in creating python-gammu binary for Windows, I will probably do it myslef, but you can expect you will have to pay some small amount (eg. 10 €) for download.