i can imagine once in Istanbul there are going to be loads of tickets knocking about, those looking to sell at inflated prices will have to make a decision at some point to move them on. I think a number of locals also get an allocation, they to will look to shift them, there is still 3 weeks yet, plenty of time to source a ticket
100%
I am confident I will get one, I'd just like 1 before I fly out as it'll make the experience all the more enjoyable.
For Madrid, I spent 48 hours worrying about a rubbed off name on my ticket and didn't relax until I got in the stadium.