| Vendor | Spec | Unit | Price | Currency | Date |
| chempricehub | National standard | Kg | 0.25 | USD | 20180818 |
| chempricehub | National standard | Kg | 1.34 | USD | 20180818 |
| chempricehub | National standard | Kg | 0.19 | USD | 20180817 |
| chempricehub | National standard | Kg | 0.19 | USD | 20180816 |
| chempricehub | National standard | Kg | 1.3 | USD | 20180816 |
| chempricehub | National standard | Kg | 1.28 | USD | 20180815 |
| chempricehub | National standard | Kg | 1.17 | USD | 20180815 |
| chempricehub | National standard | Kg | 1.64 | USD | 20180814 |
| chempricehub | National standard | Kg | 0.2 | USD | 20180813 |
| chempricehub | National standard | Kg | 1.28 | USD | 20180813 |