You will be lucky to find one in Tas AKKA.
Have a look at the Tassie forum on this site.
http://www.viczcar.com/forum/index.php/board,115.0.html
Check out this thread it is my new project car, but has info on transport back to tas, which I think is your best option.
http://www.viczcar.com/forum/index.php/topic,3025.0.html
260Z 2+2 This car is the only one I know of for sale in Tassie. The bloke has had it for sale multiple times over the last 6 month on ebay. He may sell it for cheaper than he has listed on ebay. Ring him and find out. Only semi bad thing is it has a Z31 VG30 engine and not a standard 2.6L L series motor. All depends on what you want.
http://cgi.ebay.com.au/Datsun-260z_W0QQitemZ330298473477QQcmdZViewItemQQptZAU_Cars?hash=item330298473477&_trksid=p3286.c0.m14&_trkparms=66%3A2%7C65%3A1%7C39%3A1%7C240%3A1318
260Z 2+2 Here is another from NSW, depending on your budget this may be a much better car, just drive it home on the boat.
http://cgi.ebay.com.au/datsun-260z_W0QQitemZ160306866661QQcmdZViewItemQQptZAU_Cars?hash=item160306866661&_trksid=p3286.c0.m14&_trkparms=66%3A2%7C65%3A1%7C39%3A1%7C240%3A1318
260Z 2+2 Another example this one has an SR20det motor.
http://cgi.ebay.com.au/260Z-Datsun_W0QQitemZ180316962479QQcmdZViewItemQQptZAU_Cars?hash=item180316962479&_trksid=p3286.c0.m14&_trkparms=66%3A2%7C65%3A1%7C39%3A1%7C240%3A1318
240Z Want something really nice? It is a touch on the expensive side.. but has been listed for a very long time.
http://cgi.ebay.com.au/1971-Datsun-240Z-Orange-M-Coupe_W0QQitemZ280287039762QQcmdZViewItemQQptZAU_Cars?hash=item280287039762&_trksid=p3286.c0.m14&_trkparms=66%3A2%7C65%3A1%7C39%3A1%7C240%3A1318