Oh, and on a side note, they really need to make it possible to send credits between your own characters...
What I normally do is to go to the exchange and buy items that are as close to the vendor sell-back price as I can get. Afterwards, I send those to the other toon and sell them to a vendor. Sometimes I end up a few credits shy, other times I end up ahead when some rube has decided to put it on the exchange for less than its sell-back value. (50% of its listed tool tip value.)