Those are in AU and look very sketchy. I would find a more legitimate seller.

And yeah 32GB is the max for SDHC.

Try to go for class 6 if not too expensive. I like Transcend, but other than fishy generic cards and slow speed it should be irrelevant. If that isn't a scam, then it will work q=

You can also hook up an external harddrive but you need a dedicated power source and etc.
EDIT: Yeah I've tried a 320GB but it should support the max that ext3 supports.