I ordered mine from:
http://skincarelab.stores.yahoo.net/
Click on La Roche-Posay in the menu on the left.
Initially I was wary about placing an order with a store I'd never heard of (I have this thing against buying things online, I don't know how to use eBay and I'm afraid that online stores are mostly scams) but mine came in the mail earlier than expected and seems to be the correct product...altho I gotta warn you it's a very small bottle for close to $50. I'm thinking it'll only last me 2 weeks or less??? if I use it everyday
And one other thing, the smell is very chemical-like and...odd. But if it works and doesn't make my skin red or tan that's all I need. B)