Came across a Dior sample I really like, it's not available in discount chemists, so will have to go to Myer and pay full price.
Since I will be traveling soon, I wonder if duty free would be cheaper or just same price minus GST?
If same price as Myer, may be I would get from Myer and claim GST back through TRS. As I have other stuff from Myer I will be claiming anyway.
By the way is perfume ok as carry on?
Why not go in a duty free store and compare the prices? I don't think perfume is ok as carry on. To claim GST on that, you need to get your bill verified at the airport before check in, and then put your perfume in your luggage (not your carry on bag). Upon clearing security, you can show your stamped receipt to TRS for a refund.