Aktar Filiz located near Park Vadi is the best place to find all the spices/herbs that you can’t find in most Ankara’s supermarkets.
Go with your phone and google translate as they don’t speak English, but once you find the Turkish name, they probably have it!
There’s also a spice store on Dikmen where you can find a lot of things! It’s called Sümbül Baharat Aktar.
In other areas, look for AKTAR in Google Maps. It means spices in Turkish.