The "new" updated version of Vegas Pro is on sale on steam. I've been keeping an eye out for this since I missed the similar deal on the version 14 a few months ago.
You can get "VEGAS Pro 15 Edit: Steam Edition" for $99.75USD ($130.91AUD) http://store.steampowered.com/app/689790/
get the "VEGAS Pro 15: Steam Edition" for $120.36USD ($157.91AUD)
The Pro (non-edit) version includes the DVD Architect software package for authoring DVD and Blueray discs. You may not need/want it.
!! Note that this is the steam edition, so you are limited by Steam's DRM. You can only have one instance running at any one time. You also possibly need to be online to use it? (Unless someone can confirm if you can use it in Steam's Offline mode?)