G-Man, Herrie and Dup,
It cost me R309-42 - but I had it airfreight to S.A. - on the web when you place your order there is an option for normal post as well - it was a bit cheaper but not that much really.
I am sure one should be able to local manufacture it - it is not really a piece of mechanical engineering that needs to be done - but I suspect you would need somebody like a metal machinist (don't know if that's the right name) to do it.
The hinge does not carry any weight - it is that little metal thing that the black plastic piece that slide in and out when you open and close the door is fixed to - this one is just a bit longer - so the fastening point is further outwards - and wella - your door opens wider. But yes Dup I hear what you say - you might as well just undo it completely and use a rubber stop preventing the door from getting damaged. Also an option