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Not sure if Amuse Beauty are any good but posts on Reddit say they’re legit and decent.
Thought I would share here in case anyone is interested. I grabbed some Benefit Coralista blushes that are out of stock everywhere else, 3 of them cost $104 ($34.67 each - RRP $52) plus free shipping!
Amuse Beauty run the beauty shop in Sydney Domestic Airport, so they're definitely legit