Classifieds: http://imgur.com/UF9Il4Z 1 for 1.66 ref, 1 for 2 ref, and 1 for 2.33 ref.

2x Sale at 2 ref: http://imgur.com/ABxsCJM

Less than 1 page on outpost.

Tf2outpost, for sale at 1.66:

http://www.tf2outpost.com/trade/27792096 (22 hours old, well bumped)

http://www.tf2outpost.com/trade/27793923 (13 hours, last bumped 3 hours ago)

http://www.tf2outpost.com/trade/27792951 ('bp.tf price' 17 hours, unbumped)

http://www.tf2outpost.com/trade/27777781 (unbumped since creation (3 days ago), user not online since creation, asking 1.44)

Conclusion:

Small market, sellers for 1.66 and 2 ref, sales at 2 ref -> range 1.66-2ref

Full disclosure: I own 2 heavy-weight champ belts.