You're welcome Joanne. I've never seen a free version other than a trial or unless it came bundled with another DAW. I read somewhere a version of it comes bundled with Studio One now.
Hugh2 - For me the studio version of Melodyne would be overkill because with Reaper I can use Melodyne as a vst plugin on whatever tracks I want. It's really easy to move things around in Reaper. So picking a version really depends on the DAW you are already using as well as the features you want and how much you want to spend.
FYI - The version of the monophonic Melodyne is bundled with Sonar. Sonar has ARA (Audio Random Access) so you can edit audio within Sonar using Melodyne. I have the Studio version that I can use within Sonar.
Your last sentence says it all!