Sodium-Benzoate Bangladesh Import and Export Companies

I need some Food and Pharmaceutical items. For that I need to know the price of that items. For now I shear some items name than others. You please share me the price of that items in USD/ per ton (Metric tons). Items name are given below 1. Sodium Benzoate. 2. Prednisolone. 3. Ketorolac Tromethamine-IP (white crystalline powder) 4. Dexamethason sodium phosphate.