A $70 emmission test is an absolute screaming bargain. As far as I know, there are only two places in the country that will do emmissions testing, Mitsubishi in Adelaide, and a place in Sydney. Having done numerous tests at the Mitsubishi facility, I can tell you that each test costs over $3000!!!
If one little thing is out of spec, you need to run the test again, AND pay again
This goes part way to explain why some of the "legal" aftermarket parts can be so expensive....