Yes its aliexpress and it ships from China but $9.99 USD is pretty damn cheap! I am sure these will be genuine since Aliexpress is advertising this offer on the front page.
If you haven't used aliexpress before the feedback is on this actual product not the seller as a whole so I think this is a safe buy as it has 3591 orders of which 1441 left feedback and 98.4% of people were happy.
The seller is offering a 5% discount if you buy 10 and free fedex shipping if you buy 20.
Expect the shipping to be slow.
Seems memory prices are falling faster than the AUD