Hi Shandy,
There is a very nice baby shop in Fethiye near the Fish market.
We bought 2 travel cots and had the mattresses made - not cheap at about £60 each but reasonable good quality.
They had some lovely full size cots & lots of stuff for babies. If you just walk rounfd the primiter of the market you will find it, all I can tell you it is near our dentist Volken Ozdeg!
For sheets we bought here as they are better quality and the same price. I didn't like the ones at the market at all.
Good luck with the baby.
Lorraine