Motion and Compressor are the cheapest options. By the way, I was playing right now with Adobe Media Encoder on a (almost) new mac mini and I find that I am able to export in Prores. Funny thing, I can't remember having purchased anything from Apple. I only downloaded and deleted the Fcpx trial a while ago. Andrea
Edit: was it because of Ffmpeg? Handbrake?
This link might help http://support.apple.com/kb/DL1396
Also for xdvar could be the trial... did you also run an update after installing the trial? if so that's a nice way for a quick codec install. lol.