Well mkboy1313 answered the question - TOW decides the shipping format, although I could split the orders at additional shipping cost when ordering. It would be nice though to have some additional shipping options, such as insurance. That should also protect the TOW margins. To be honest, I don't know if an insurance fee is already included in the shipping cost.

And what about changing to the carrier of amazon.com? Books from them are always delivered faster and I've never had a problem with an Amazon.com delivery (to be honest - I never had problems with TOW deliveries so far either..)