| Vendor | Spec | Unit | Price | Currency | Date |
| chempricehub | National standard | Kg | 12.05 | USD | 20180801 |
| chempricehub | National standard | Kg | 11.76 | USD | 20180801 |
| chempricehub | National standard | Kg | 1.72 | USD | 20180723 |
| chempricehub | National standard | Kg | 10.93 | USD | 20180720 |
| chempricehub | National standard | Kg | 11.31 | USD | 20180720 |
| chempricehub | National standard | Kg | 1.77 | USD | 20180719 |
| chempricehub | National standard | Kg | 11.41 | USD | 20180719 |
| chempricehub | National standard | Kg | 1.71 | USD | 20180718 |
| chempricehub | National standard | Kg | 2.04 | USD | 20180717 |
| chempricehub | National standard | Kg | 12.89 | USD | 20180716 |