Hello, This is my second suggestion.

Classifieds:

http://backpack.tf/stats/Unique/Halloween%20Spell%3A%20Soldier%27s%20Booming%20Bark/Tradable/Craftable

1 at 0.22

7 at 0.33

3 at 0.44

3 at 0.55

7 at 0.66

2 at 0.88

10 at 1 ref and more.

Outpost Sellers:

http://www.tf2outpost.com/trade/23478202 0.11

http://www.tf2outpost.com/trade/23483133 0.11

http://www.tf2outpost.com/trade/23440072 0.11 (I think)

http://www.tf2outpost.com/trade/23469321 0.22

http://www.tf2outpost.com/trade/23476093 0.22

http://www.tf2outpost.com/trade/23469114 0.33

http://www.tf2outpost.com/trade/23479179 0.33

http://www.tf2outpost.com/trade/23467758 0.33

http://www.tf2outpost.com/trade/23472761 0.33

http://www.tf2outpost.com/trade/23479158 0.33

http://www.tf2outpost.com/trade/23472254 0.33

http://www.tf2outpost.com/trade/23378918 0.33

http://www.tf2outpost.com/trade/23459690 0.33

http://www.tf2outpost.com/trade/23468362 0.33

http://www.tf2outpost.com/trade/23468756 0.33

http://www.tf2outpost.com/trade/23444522 0.33

http://www.tf2outpost.com/trade/23449601 0.33

http://www.tf2outpost.com/trade/23440510 0.33

http://www.tf2outpost.com/trade/23426539 0.33

Unsolds at 0.66-1 ref:

http://www.tf2outpost.com/trade/23381352 5 days

http://www.tf2outpost.com/trade/23384357 4 days

http://www.tf2outpost.com/trade/23391130 4 days

http://www.tf2outpost.com/trade/23371201 4 days

http://www.tf2outpost.com/trade/23403263 3 days

http://www.tf2outpost.com/trade/23411365 3 days

http://www.tf2outpost.com/trade/23413917 3 days

http://www.tf2outpost.com/trade/23418233 3 days

http://www.tf2outpost.com/trade/23418224 3 days

http://www.tf2outpost.com/trade/23423753 2 days

http://www.tf2outpost.com/trade/23407918 3 days

http://www.tf2outpost.com/trade/23436837 2 days

http://www.tf2outpost.com/trade/23445917 1 day

http://www.tf2outpost.com/trade/23457861 1 day

http://www.tf2outpost.com/trade/23450842 1 day

http://www.tf2outpost.com/trade/23426205 2 days