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This is one of the worst ways to negotiate a deal. Nobody is going to lowball themselves. Make a reasonable offer with what you're willing to pay in a private message and see how flexible he is.
Just shoot me a reasonable offer, I've listed what I'd like to get for this kit and if your familiar with Aimgain, then you know this is a quality kit at a great price but none the less I want to move it so I will listen to reasonable offers. Send me a pm and worst thing that can happen is I'll say "no and thank you".