Well let me break it down for you then:
work a deal: if he ends up having to pay something for shipping, why not haggle a little to get the 4k down somewhat.
negotiate: its a verb and the definition is to arrange for or bring about discussion and settlement of terms.
So if you put the two together and if Gamma wants him to put in 4k to ship it, maybe I'm implying that if all else fails and he has to pay something to get it shipped why not try and get the price lower
