I don't think you can get AppleCare for the Mac anymore. Looks like AppleCare+ replaces AppleCare, with the difference in coverage being that AppleCare+ for Macs covers physical damage (with an addition service fee), whereas AppleCare didn't.
If you already have AppleCare, I don't see where you can upgrade to AppleCare+.
Looks like you can now only add AppleCare+ within 60 days of buying a Mac.
https://www.apple.com/support/products/mac.html
Just call Apple and they'll sell you the non-plus version.Where are people still finding boxed copies of AppleCare? No luck at any authorized dealer...
The advantage of AppleCare+ is great, but alas is not available world wide. Restricted to US and Japan last time I looked, certainly not Down Under.
AppleCare+ for iOS with accidental damage coverage has now replaced AppleCare globally but as mentioned above AppleCare+ for Mac is only available in Japan and the USA.
For anyone interested, it's available in the UK as well