Brade said:

$100 for it though!

I guess I'll give it a shot if I find nothing else, but there's got to be a free utility that does this somewhere.

You might also try just burning the file directly onto the disc via finder. I believe that will work as well. The PS3 should just read the file as though it is a data disc. Just mount your recordable BD25 and drag the BDMV into the disc. Hit burn. This works with my Sony blu Ray player so I'm thinking the PS3 should be able to read it as well.