Classifieds:

http://backpack.tf/classifieds/?item=Widowmaker&quality=11&tradable=1&craftable=1 - (2 at 1 key, 7 at 1.1 keys, 9 at 1.2 keys)

Sellers at 1 key:

http://www.tf2outpost.com/trade/25105283 - unsold (3 hours)

http://www.tf2outpost.com/trade/25099298 - unsold (14 hours)

http://www.tf2outpost.com/trade/25091044 - unsold (1 day)

Sellers at 1.1 keys:

http://www.tf2outpost.com/trade/25094630 - unsold (23 hours)

http://www.tf2outpost.com/trade/25071109 - unsold (2 days)

http://www.tf2outpost.com/trade/25021925 - unsold (6 days)

http://www.tf2outpost.com/trade/25012541 - unsold (1 week)

Sellers at 1.2 keys:

http://www.tf2outpost.com/trade/25105817 - unsold (less than an hour) (relisted from here: http://www.tf2outpost.com/trade/25103716 and here: http://www.tf2outpost.com/trade/25103322 and here: http://www.tf2outpost.com/trade/25092259 and here: http://www.tf2outpost.com/trade/25091337 )

http://bazaar.tf/trade/1221456 - unsold (1 hour)

http://www.tf2outpost.com/trade/25096103 - unsold (20 hours)

http://www.tf2outpost.com/trade/25095709 - unsold (21 hours)

http://www.tf2outpost.com/trade/25095077 - unsold (22 hours)

http://www.tf2outpost.com/trade/25090781 - unsold (1 day)

http://www.tf2outpost.com/trade/25067545 - unsold (2 days)

http://www.tf2outpost.com/trade/25060215 - unsold (3 days)

http://www.tf2outpost.com/trade/25050848 - unsold (4 days)

http://www.tf2outpost.com/trade/25048340 - unsold (4 days)

http://www.tf2outpost.com/trade/25030599 - unsold (5 days)

http://www.tf2outpost.com/trade/24981081 - unsold (1 week)

http://www.tf2outpost.com/trade/24988986 - unsold (1 week)

http://www.tf2outpost.com/trade/25010339 - unsold (1 week)

http://www.tf2outpost.com/trade/25007931 - unsold (1 week)