following modifiers apply to negotiations
Don is suspicious toward you - he don't know you, and he already know you're not telling him the truth
-1 dice Haggling with Don, annoys him, he want the job done, the budget has been set.
-1 dice Don, create an impression of power. Street reputation of 5, against your 0. You don't want to sell cheap, but you want to sell.
-5 dice.
+3 dice due to an excellent posting from all of you - the pride discussion, information on the deadly difficulty on the matrix side from boy
That is a total
-4 dices for you, leaving you with 7 hits
against the opposing roll of his
10 dice pool ->
10d6.hits(5)=25 net hits - you won

You can get the payment in equipment of availability 12. and you can use the net hits to choose some items of even higher availability - max 15. So it could be one item of 15 and the other of 14 and remaining in up to 12.