Cement 42.5

i am a broker that has a client that needs to purchase cement 42.5 n/r.
the buyer needs the manufacturers to send their
lowest possible fob prices.
the total cement nrequirements is as follows:
1.) 600,000mt - yearly ...... 50,000mt monthly ......opc 42.5 n/r ...... 50 kg bags
2.)400,000mt - yearly ...... 33,000mt monthly ...... opc 42.5 n/r in bulk