G'day Brian,
Can't help you with the Jarrows, sorry. However, there's this compounding pharmacy services place that I've found. It says it's approved by The Pharmacy Board of NSW. On their ordering page, they mention that you can phone them, so I figure if you can phone them, then you can probably pay by credit card or organize other payment options e.g. cheque, etc.. I really don't know, but here's the site.
It's awfully expensive though!!! 
You might be able to just phone them and ask. They appear to be based in Ballina, N.S.W. Contact details including phone number and fax are at the bottom of their website. Even if they can't help you then they may know more about how to get it some other way. I know there's a place in Everton Park in Brisbane that is selling it, but have not been able to find the address of the shop or even the name of the shop. As I mentioned on another site, I think that it's some sort of Sports Supplement business.
http://www.custommedicine.com.au/order.php
Quote:
(2) Non-prescription Items
You can order any non-prescription item by:
* Internet order via our online shop on this website.
* By phone, fax or email. If you fax or email any orders please include your full name, delivery address, contact phone number, your order and credit card details including expiry date.
* You can also download the order form located above fill it in and fax it to us.
If you contact us by phone we can further guide you to the suitability of these products to suite your needs. Alternatively we can arrange to alter the ingredients in any preparation to suite your individual requirements or prepare something totally new for you.
* Please note no non-prescription products will be compounded until an order has been received as all compounded products are tailor made.
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http://www.custommedicine.com.au/shop/
Vitamin B12 (Methylcobalamin) 4mg Lozenges 30 loz
$59.09
I have absolutely no idea if this is of any use to you or anything about this company. Just thought I'd pass it on as I know how difficult it is to find here in Australia.