Turkish Lira

Finally got my two weeks booked at the Rhodes.
It's been a while since I have been to Icmeler and it used to be the case that it was better to take a small amount of Lira and change Sterling in the resort. Is this still the case and if so, does anyone know where can you buy say £100 of Lira in the UK. The Post Office has a £400 minimum.
Thanks

Thanks