See rule 15. " All discussions including offers, acceptances and refusals should be shown clearly in the thread (not by email or Private Conversation). Once a deal is agreed you may use whatever form of external communication you like to finalise payment details etc. Your general location and details of equipment are not considered to be valid reasons for using off thread communications. We insist on this rule because we need to see all the negotiations to be able to mediate a solution to a dispute."
State what you have and what you want for it. The going rate is 93% of face value.