Refrigeration system sandwich panels

Dear Sirs,
I am contacting you because my Engineering Company is studying the best offer for various jobs turn-key it is dealing all over the world.
The jobs regard huge refrigeration systems with the construction of numerous large cells.
We need a starting supply of 33000 m2 of 15 cm sandwich panels.
Can I have your best price for this one?
Furthermore, which are the delivering time of the supply and payment form?
Waiting for your kind reply I offer my best regards.
Eng. Salvatore