Played around with the buggy prices at IST a little and found two things;

- meet and greet service (arrival) is really expensive even when you don’t look at it from a Turkish Lira perspective

- at departure: when you get a buggy from the central locations to your gate, the price is €5 per adult, 2.5 for kids 7-12 and free for ages 6 and under. Would consider this if traveling with kids.