Street food in Istanbul is generally affordable. Prices can vary depending on the type and location, but on average, you can expect to pay around 5-10 TRY for a simit, 15-25 TRY for a börek, and 25-35 TRY for a balık ekmek. More elaborate dishes like kumpir can cost between 30-50 TRY, while a serving of midye dolma might be around 1-2 TRY per piece.