Have you considered rebuilding it yourself or is it too bad? If its just replacing the gaskets, etc it isn't that difficult.
If yours is really bad and money is short I have several laying around you can have for the cost of shipping. I just went to a HIF-6 SU as I was having continued problems not with the ZS carb itself but the darn water choke. Perhaps you could use your choke assembly and one of mine to save a little cash. Anyways if interested let me know.