Counter-suggesting a different range based on the proof provided by Get Rekkt, all credit for proof gathered goes to him

"Sellers:

Outpost

http://www.tf2outpost.com/trade/20789871 - 2 keys

http://www.tf2outpost.com/trade/20760620 - 2 keys

http://www.tf2outpost.com/trade/20880277 - 2 keys

http://www.tf2outpost.com/trade/20854611 - 2 keys

http://www.tf2outpost.com/trade/20563231 - 2 keys each

http://www.tf2outpost.com/trade/20858492 - 2.1 keys

http://www.tf2outpost.com/trade/20743690 - 2.2 keys

http://www.tf2outpost.com/trade/20851021 - 2.2 keys

http://www.tf2outpost.com/trade/20576493 - 2.2 keys

http://www.tf2outpost.com/trade/20743140 - 2.2 keys

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Unsolds

http://www.tf2outpost.com/trade/20397981 - 2.3 keys/2 weeks, autobump

http://www.tf2outpost.com/trade/20517911 - 2.3 keys/1 week, bumped

http://www.tf2outpost.com/trade/20822246 - 2.3 keys/2 days, bumped

http://www.tf2outpost.com/trade/20404785 - 2.4 keys/2 weeks, keeps bumping. No longer in BP

http://www.tf2outpost.com/trade/20852954 - 2.4 keys/1 day, autobump

http://www.tf2outpost.com/trade/20847953 - 2.4 keys/1 day, autobump

http://www.tf2outpost.com/trade/20818581 - 2.4 keys/1 day, bumped

http://www.tf2outpost.com/trade/20842130 - 2.4 keys/1 day, bumped No longer in BP

http://www.tf2outpost.com/trade/20787997 - 2.4 keys/3 days, poorly bumped

http://www.tf2outpost.com/trade/20847313 - 2.5 keys/1 day, bumped No longer in BP

http://www.tf2outpost.com/trade/20113592 - 2.5 keys/1 month, keeps bumping

http://www.tf2outpost.com/trade/20599237 - 2.5 keys/1 week, bumped

http://www.tf2outpost.com/trade/20613156 - 2.5 keys each/1 week, poorly bumped

http://www.tf2outpost.com/trade/20529154 - 2.5 keys/1week, poorly bumped

http://www.tf2outpost.com/trade/20726084 - 2.5 keys/5 days, NOT bumped Trade expired

'bp.tf prices'

http://www.tf2outpost.com/trade/20678321 - 6 days/bumped

http://www.tf2outpost.com/trade/20512189 - 1 week/bumped

http://www.tf2outpost.com/trade/20866736 - 12 hours(young)

http://www.tf2outpost.com/trade/19979162 - 1 month/Bump

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2.2 keys seems to be a common selling point, but 2 keys still happens as often

At time of posting this, the classifieds contains 1 listing @ 2.2 keys, 4 listings @ 2 keys, and 1 listing @ 1.8 keys (quickseller)