There is paypal, also, have you tried seeing if you could order them off Amazon.com's portal for your region?
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You may wish to get in contact with CR (Niviene, theOcho, Avatea, et-whoever-I-forgot) to see if they can set you up with some sort of deal especially since it has to do with schooling. Might even make for a good snippet for Paragon Studios, etc. as an advertising gimmick. Who knows.
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Howdy! I too am from South Australia, and I would like to know... where the hell were classes like yours when I was at school? :P
Seriously, nobody in SA sells CoH timecards, or even PlayNC timecards, and EB Games can't even order them in.
Your best bet would be for the school to hook up a paypal account with their credit card and add the time, as paying via paypal doesn't link the paypal account to the PlayNC account, providing you cancel the recurring subscription.
Either that, or as was suggested, get in touch with one of the community reps and see if they can offer you a deal of some kind..
Playing CoX for school? Do you get an A if you roll a Scrapper and complete the RWZ challenge? Hot damn. If you're ever looking for a team, hit me up with a PM, I'd love to hang out and find out what drugs your teachers are on.. err, I mean, where such enlightened and educated individuals found their almighty wisdom.
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Have you tried to order them on a retail store's website and have them physically shipped to your location? That might be a solution.
I did a quick google search and found them available at these sites.
Newegg.com, BestBuy.com or Amazon.com
Hope this helps.
Before the option to pay for this game with Paypal became available, I used hotcdkey.com to buy my game time. They send the game time codes to you by e-mail within a few minutes (10ish) after buying, which is obviously much better than shipping the cards. I checked the site and they also have a cheap offer on 90 days of game time including the game itself.
Thanks for the tips gang!
One of the students in the class uses a website for his WoW game time and they offer CoH cards too. So we're going to try them ...
And thanks for that idea Ninus - I did contact NCSoft via email a little while back, but didn't hear back. I'd certainly be happy for them to use us as a bit of PR!
And Mr Fallstar? I am the teacher! 
We only got to do this course this year because of the New SACE - before now it would have been very difficult.
G'day people!
I'm hoping someone can help me with this - does anyone know of a source for game time cards outside of the US?
We're using CoX as part of a senior English/Maths class here in South Australia and the school is going to pay for 3 months of access for the enrolled students. This is fine for the "school owned" accounts.
It gets interesting though - some of the students are going to purchase their own accounts for CoX and we want to be able to still give them 3 months of "free" access, but don't want to put the school credit card details into their accounts!
I'm hoping there's a source for game time cards (or even just codes!)
Or are we ... as they say ... "boned"? lol