Buying copper cathodes 99,99, 2000 mt

We want to buy copper cathodes and are looking for suppliers for a long-term cooperation.
Name: Copper Cathodes 99.99 %
Quantity: 2,000 Metric tons each month. (First trial order is 500-1,000 tons.) Standard specification: Grade “A”, GB/T 467-2010. Or Copper Cathodes, Electrolytic Grade ‘A’ at LME standards at a purity of min. 99.97%.(Cu-CATH-1, EN 1978).
Payment Term:100% L/C，It is irrevocable, indivisible, non-transferable and issued by a bank in China.
If you have the above copper source and supply capacity, please quote at the best prrice, 25% Gross fixing London.