Congrats. I saw one on ebay last week and was very tempted to get it even though I have 3 other versions of it, all of which are a little bit different.
Richard Coyle used to make the STIII Phasers for Rodd.com, that was how I got mine a while ago. You sometimes see them come up on ebay, but people want crazy prices for them since they are very rare. Good luck.