Yup it is, however you may search ebay for trackir 2.
The TrackIR 3-Pro™ is NaturalPoint®'s premium product, the best optical headtracking system available. Blazing along at a refresh rate of 120fps, TrackIR3-Pro™ is 50% faster than the TrackIR 3™ (80fps), and 4 times faster than a standard WebCam (30fps). Based on a new image processor, TrackIR 3-Pro™ has 67% more resolution and improved optical performance that allows it to work in direct sunlight, delivering a performance difference that will rock your view! TrackIR 3-Pro™ is the best optical headtracker that money can buy.
With trackIR 2 I had to pull the shade down on the window directly behind my PC. I didnt have to sit in the dark just direct sunlight would cause it to loose track.
TrackIr 3 doesnt have that problem. Thats the only difference I noticed between 3pro and 2.
Also, you only make small head movements. The trick is be be at about arms length from the device and set a decent deadband so you dont have to sit like you have a neck colar on. Then adjust the pan speed.
Then just sit comfortably. You wont be whipping your head around. Personally I find that leaning slightly while my head stays relatively straight works best for me.
As I said above I believe by going through SimHQ or Netwings you can save 15 USD on TrackIR3 pro.
If Tom (wklink) is still around maybe he can confirm.
If fact here's a post he made a while back
I think that if there appears to be a large enough of a potential following for the TIR3 then you may be able to get a discount.
Right now there is a 15 dollar discount via SimHq. Check the front page. If a different ad is on the front page when you fire up the web page just reload the page and the ad will come up.
Here is a direct link.
http://www.naturalpoint.com/banners/simhqjuly2004.html
Thomas S. Cofield
332nd Flying Mongrels
Feature Editor, SimHq.com
cofster1@simhq.com
Dunno if its still valid...