Substitutes for Turkish red pepper paste (biber salçası)?
If you're wanting to make some different Turkish foods, I'd hazard a guess you enjoy cooking, so why not make your own? I found a recipe classed as 'Easy', taking 1 hour to prepare and 50 minutes to cook. I read it has the consistency of tomato paste (contains no tomatoes) and looks to be from the photo.

Among the list of ingredients is bullhorn peppers. Perhaps a local name but when I looked up what they were, they looked exactly like Hungarian sweet peppers. The name 'bullhorn' comes from their shape as they curve and taper to a point like horns. Here's a photo: 

Give it a try! If you really enjoy the Turkish recipes you make,  you'll likely want to make them again so having some biber salçası around will come in handy.
http://www.sbs.com.au/food/recipes/pepper-paste-biber-salcasi