The helmet was found during excavations in 2016 in the field in the vicinity of airfield Pitomnik (Stalingrad region). Beside the helmet were found aluminum fragments aircraft of the Luftwaffe (presumably from a JU 52)
— 10 USD by Russian Post
— 25-40 USD by courier service EMS
— 30-40 USD by Russian Post
— 40-60 USD (depends on customer's country) by courier service EMS
What is the difference between Russian Post and EMS courier service? Read here - link