We'll place a substantial order with you if your price is reasonable.

如果你方的价格合理，我们将大量订货。

youdao

We could reduce our price by 5% if you place a substantial order with us.

如果你们订货量大的话，我们可以减价5%。

youdao

Until now, it has been necessary for anyone approaching prospective investors in the US to have a substantial pre-existing relationship in place in order to actually discuss a particular investment opportunity with them or provide them with marketing materials.

FORBES: The Pointy End of Capitalism