Gasmask cannister was purchased from one of the farmers of the Volgograd region (formerly Stalingrad region). According to him this canister was found in an old barn by a friend of his father in one of the villages of Stalingrad.
— 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