a/c

I've got a faulty tx valve in the air conditioning system (which caused the seals in the compressor to blow out, but that's another $1000 story).
I've been told they can't separate the tx valve from the evaporator, so instead of costing $160 for a new tx valve (plus labour), they need to also replace the evaporator which costs $700.
These prices are Aussie, and the parts will come from Japan.

Does anyone know of any alternatives?

Bruce