Not that gunbroker and the local market are the same thing but still interesting.
http://www.thetruthaboutguns.com/2013/02/foghorn/charting-the-price-of-an-ar-15-during-the-great-awb-panic/#more-200953
http://imgur.com/a/YJ782
http://www.thetruthaboutguns.com/2013/02/foghorn/charting-the-price-of-an-ar-15-during-the-great-awb-panic/#more-200953
http://imgur.com/a/YJ782