Well , you could contact AstroSystems in the USA and get some key components and build one yourself (recommend you use marine grade plywood).
You can obtain teflon and Ebony Star or equiv pretty cheaply and need not buy an entire dob kit.
A couple of places that sell components (there are lots of places who'll sell premade special parts - saves you making them.
http://www.dobstuff.com/pricing.htm
http://www.astrosystems.biz/products.htm
Stack of links here -
http://stellafane.org/misc/links.html#AltAz
Aren't there a couple of blokes who make Starsplitter clones here in Oz , you could look them up and ask for some of those special / tricky to make components too.