There was a discussion on the board some weeks back about mustard oil. I recommended Indian mustard oil for Bengali food that I get from an Indian grocery store called "Viks" in Berkeley. I didnt have the brand name with me then....I bring the oil home and pour it into glass bottles since I dont like to keep oil in plastic containers.
We went grocery shopping to Berkeley and got fresh supplies, I now have the brand name. Its called "Tez". Its manufactured by Recon Oil Industries Ltd., a well established Indian name. It is available in 500 ml plastic bottles and has a label in Bengali, Urdu, Hindi and English. I hope you find it satisfactory.