| Vendor | Spec | Unit | Price | Currency | Date |
| chempricehub | National standard | Kg | 1.39 | USD | 20180321 |
| chempricehub | National standard | Kg | 0.23 | USD | 20180320 |
| chempricehub | National standard | Kg | 1.51 | USD | 20180319 |
| chempricehub | National standard | Kg | 2.05 | USD | 20180319 |
| chempricehub | National standard | Kg | 0.21 | USD | 20180319 |
| chempricehub | National standard | Kg | 0.23 | USD | 20180319 |
| chempricehub | National standard | Kg | 2.05 | USD | 20180318 |
| chempricehub | National standard | Kg | 0.23 | USD | 20180317 |
| chempricehub | National standard | Kg | 1.37 | USD | 20180315 |
| chempricehub | National standard | Kg | 2.0 | USD | 20180314 |