发需要成本，英文怎么表达，大家帮忙

Dear, we cann't help you because of the increasing cost and small quantity.

thanks,相互学习

Good expression!

dear,that's below our MOQ, the unit cost will be higher than standard price. Hope u can increase quantity for me to lower the price for u.

we are sorry we can't do it due to the high development cost and small quantity

The development cost, the quantity is too small, we can't do it