Classifieds: http://backpack.tf/classifieds?item=Backstabber%27s+Boomslang&quality=11&tradable=1&craftable=1&australium=-1&fold=0

Screenshot(s) of Classifieds:

http://imgur.com/AIspr6L

<Sellers>

1.7 keys | http://backpack.tf/item/2348313017 | http://backpack.tf/u/76561198315555780 | Listed about 2 hours ago [Bumped]

1.74 keys | http://backpack.tf/item/5072376995 | http://backpack.tf/u/76561197999873164 | Listed about 5 hours ago [Bumped]

1.74 keys | http://backpack.tf/item/2446847489 | http://backpack.tf/u/76561198317606171 | Listed about 22 hours ago [Bumped]

1.78 keys | http://backpack.tf/item/5284118054 | http://backpack.tf/u/76561198357741990 | Listed 3 days ago [Bumped]

1.78 keys | http://backpack.tf/item/5354478013 | http://backpack.tf/u/76561198308976829 | Listed a day ago [Bumped]

1.78 keys | http://backpack.tf/item/2438287615 | http://backpack.tf/u/76561198308976829 | Listed a day ago [Bumped]

1.84 keys | http://backpack.tf/item/5460441232 | http://backpack.tf/u/76561198044515552 | Listed 5 days ago [Bumped]

2 keys | http://backpack.tf/item/4954302315 | http://backpack.tf/u/76561198309563748 | Listed about an hour ago [Bumped]

2 keys | http://backpack.tf/item/4967876900 | http://backpack.tf/u/76561198306766562 | Listed 10 minutes ago

2.12 keys | http://backpack.tf/item/2384030913 | http://backpack.tf/u/76561198069813252 | Listed 2 months ago [Bumped]

Taking 1.75 from 1.74 sellers rounded, because 1.7 seller is young and 1.78, which would be rounded to 1.8, is unsold for multiple days.