Sirius in Brisbane sell this one:
http://www.sirius-optics.com.au/orio...ut-tripod.html
Not sure if there are Orion suppliers near you.
They are easy enough to make if you are a woodworker (mine is home-made and works well: even for my 25x100's), or even using square steel tubing, and there are a lot of designs out there...
- Dean