As for the list of Free Agent Defensemen, use Capgeek's list:
Link
A quick c/p of those under 30 from that has:
Wideman, Dennis » D WAS 28 $3,937,500 2012 (UFA)
Suter, Ryan » D NAS 27 $3,500,000 2012 (UFA)
Carle, Matt » D PHI 27 $3,437,500 2012 (UFA)
Colaiacovo, Carlo » D STL 29 $2,125,000 2012 (UFA)
Morrisonn, Shaone » D BUF 29 $2,075,000 2012 (UFA)
Campoli, Chris » D MTL 27 $1,750,000 2012 (UFA)
Grossman, Nicklas » D PHI 27 $1,625,000 2012 (UFA)
Jurcina, Milan » D NYI 28 $1,600,000 2012 (UFA)
Hunwick, Matt » D COL 26 $1,550,000 2012 (UFA)
O'Brien, Shane » D COL 28 $1,100,000 2012 (UFA)
Gilroy, Matt » D TBL 27 $1,000,000 2012 (UFA)
Lundin, Mike » D MIN 27 $1,000,000 2012 (UFA)
Eminger, Steve » D NYR 28 $800,000 2012 (UFA)
Lepisto, Sami » D CHI 27 $750,000 2012 (UFA)
Rome, Aaron » D VAN 28 $750,000 2012 (UFA)
Sulzer, Alexander » D VAN 27 $700,000 2012 (UFA)
Meech, Derek » D WIN 27 $700,000 2012 (UFA)
Garrison, Jason » D FLA 27 $675,000 2012 (UFA)
Woywitka, Jeff » D NYR 28 $650,000 2012 (UFA)
Reese, Dylan » D NYI 27 $635,250 2012 (UFA)
Oystrick, Nathan » D PHO 29 $600,000 2012 (UFA)
Roy, Mathieu » D CAR 28 $600,000 2012 (UFA)
McKelvie, Zach » D BOS 27 $600,000 2012 (UFA)
Smaby, Matt » D ANA 27 $600,000 2012 (UFA)
Fortunus, Maxime » D DAL 28 $587,500 2012 (UFA)
Stoner, Clayton » D MIN 27 $550,000 2012 (UFA)
Johnson, Aaron » D CLB 28 $550,000 2012 (UFA)
Callahan, Joe » D MTL 29 $550,000 2012 (UFA)
Harrold, Peter » D NJD 28 $550,000 2012 (UFA)
Liffiton, David » D COL 27 $525,000 2012 (UFA)
Syvret, Danny » D STL 26 $525,000 2012 (UFA)
Spang, Dan » D DAL 28 $525,000 2012 (UFA)
Flood, Mark » D WIN 27 $525,000 2012 (UFA)
Sullivan, Sean » D FLA 27 $525,000 2012 (UFA)
Bell, Brendan » D NYR 28 $525,000 2012 (UFA)
Collins, Sean » D WAS 28 $525,000 2012 (UFA)
Miskovic, Zach » D WAS 26 $525,000 2012 (UFA)
Richmond, Danny » D COL 27 $525,000 2012 (UFA)
Rodney, Bryan » D EDM 27 $525,000 2012 (UFA)
Gervais, Bruno » D TBL 27 $525,000 2012 (UFA)
Petiot, Richard » D TBL 29 $525,000 2012 (UFA)
Moore, Mike » D SAN 27 $512,500 2012 (UFA)
Scott, John » D CHI 29 $512,500 2012 (UFA)
McIver, Nathan » D BOS 27 $512,500 2012 (UFA)