Charging shipping when using multiple dropshippers

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Our store would like to use a few different custom printing drop shippers as well as selling our own products that would ship from us.  Currently, if someone orders 2 things, each from a different drop shipper or one from a drop shipper and one from me, my store charges shipping based on the first item put in the cart.  So, I wind up eating the cost of shipping if they aren't charged enough.  Is there a better way to handle this?  

Any help is appreciated.  Thanks!