The Mopar stuff is only at dealers, not sure what they charge.
Mobil Mobilfluid 424 is the only equivalent (all the evidence suggests that it's the same stuff.), I recon most people on AJOR use it. Goes for ~$8-$12 per litre.
Apparently 7-11 servos stock it, but I get it online from EC Lubes;
http://www.eclubes.com.au/products/v...mobilfluid-424
If you contact them they'll say you need to buy through a NSW distributor (who seem to be more expensive and more difficult to deal with in my experience.). But if you order it online they'll still send it.
Otherwise if you're in a bind I have a few bottles you can grab.