I was thinking about selling my DPMS AR15. If somebody outside my area wants it, how would I go about shipping it (do I have to go through a dealer)? And what kind of cost is involved? For that matter (I'm terrible when it comes to selling stuff) what do you think a fair asking price for it would be. dpms ar15 a2 (the 20" bbl classic model), retails for about 900, light usage, like new condition (about 3 yrs old), throwing in a 10 and a 30 rd mags.