Classifieds: http://backpack.tf/classifieds?item=Taunt:%20Bad%20Pipes&quality=5&tradable=1&craftable=1&australium=-1&particle=3001&killstreak_tier=0

Screenshot(s) of Classifieds:

http://imgur.com/33LpnLP

<Sellers>

40 keys | http://backpack.tf/item/4724681856 | http://backpack.tf/u/76561198164651434 | Listed 8 days ago [Bumped]

80 keys | http://backpack.tf/item/4581541681 | http://backpack.tf/u/76561198035897364 | http://www.tf2outpost.com/trade/28847640 | Listed 1 month ago [Bumped]

http://www.tf2outpost.com/trade/28888115 - b/o: 75 keys (1 week)

Sold:

http://backpack.tf/profiles/76561197995872071#!/compare/1490918400/1491004800 - sold with Blizzardy Storm Human Cannonball for Tesla Coil Human Cannonball = 26 keys (bulky but supports the lower price) (within the past month)

http://backpack.tf/profiles/76561197965601027#!/compare/1492560000/1492732800 - sold for 30 keys (quicksold)

http://backpack.tf/profiles/76561198114402400#!/compare/1489536000/1489622400 - sold for 60 keys (outlier) (2 months ago)

http://www.tf2outpost.com/trade/28778448

http://backpack.tf/profiles/76561198090520837#!/compare/1489017600/1489104000 - sold for 25 keys (low) (2 months ago)

http://backpack.tf/profiles/76561197965601027#!/compare/1493424000/1493510400 - sold for 35 keys

Credits to polar

#TeamBusyPeople