I am a Newbie here, but I found these tickets for myself and wanted to share it since I am trying to find decent tickets for Peasech.
https://online.turkishairlines.com/internet-booking/availabilityInt.tk I'm not sure if this link will work, but i found the following flights available.
Leaving on Sunday 4/17/16 and returning 5/2/16 and i see that there's that whole week with the same prices.
I hope that this information is helpful.
Thanks,