I can only shop online for bras these days. It takes a bit of getting used to, but it's way cheaper than going to the specialty shops and paying $150-$200 for one bra! I'm a US size 32H - I think about an AUS size 10H. Try finding that in a department store for $30!
There's a US online store that might help you out, Heather - it's called Breakout Bras, and they carry quite a pretty wide range. I believe you'd be looking for a 30C in US sizes. (google the shop and you should come up with it no problem.)
Hope you find something good soon! I hate poor fitting bras. Just makes everything you wear seem wrong.