Get them from Boots.
My mum bought a pair, paid a fortune for them from a well known site, I think it might have even been an Amazon reseller.
Anyway, she thought they were the bees knees.
My girlfriend came round a couple of weeks ago, getting ready in the morning mum asked if she could use her straighteners to save heating hers up.
Immediately realised her ones which she had for two years were fake. They feel identical, but mums hair take twenty minutes to straighten, Bethan's takes seconds.
The heat and the coating on genuine ones t the difference. Lots of companies but broke ones or new spare casings because they are available and fit cheap internals and plates then resell them as genuine.