Minimum order quantity or low order fee per MANUFACTURER

I am selling clothing and I have several different brands. I would like to impose a minimum order quantity or a low order fee based one each manufacturer. The reason is that if I am charged shipping from each different company so if my customer orders 2 items from company A 2 from company B and 2 from company C I am then up for shipping for three different companies. If I impose a low order fee it does not really help because that would only cover one lot of shipping.
What would be ideal is to have a minimum quantity per manufacturer and if that quantity is not met then a low order fee imposed, giving the customer the option to pay the fee or purchase more items from that manufacturer. I imagine that other people are faced with the same issue.
TIA
Alice.