You can find that in specialized stores located in different areas of Ankara.
The Bahçelievler Happy Party Store is located in Çankaya.
Another nice store for party supplies is EuroFlora.
The store is located on your way to Ikea, click here for a map
They have a website with a section for Halloween party supplies.
You can also find Christmas decorations there! Because Christmas is coming next… 😉
You still have time to order a costume online from Partidunyasi.com. There is a good selection and shipping is usually fast!
There are costumes & supplies on Hepsiburada.com also, the turkish Amazon.
2-day shipping is offered on lots of items!
Search for “kostüm”