Possible much lower than 3 flat.

2.33 key, and 3 wrapped for 3 and one who will provide wrap for 3 (those are 2 so).

selling below 3:

http://bazaar.tf/trade/245374

selling for 2.4

http://www.tf2outpost.com/trade/11452851

selling for 2 (3 for hat+wrap)

http://www.tf2outpost.com/trade/11401591

2 willing sellers at 2 (wrapped for 3)

http://www.tf2outpost.com/trade/11266169

selling wrapped for 3, took 6 days to sell 2 of his 3

http://www.tf2outpost.com/trade/11424085

sold for 1.4

http://www.tf2outpost.com/trade/11418162

sold for 2

http://www.tf2outpost.com/trade/11215281

wrapped for 3

http://www.tf2outpost.com/trade/11420213

wrapped for 3

http://www.tf2outpost.com/trade/11422362

wrapped for 3

http://www.tf2outpost.com/trade/11266169

wrapped for 3

http://www.tf2outpost.com/trade/11340785

wrapped for 3

so, some offers DO still reach 3, but 2 is readily possible. And sorry again shenanigans, couldn't drop treasure today, so here is a replacement.

unsold for 3

http://bazaar.tf/trade/233733

a week at 3

http://bazaar.tf/trade/240828

4 days at 3 (4 keys, seller's wrap)

http://bazaar.tf/trade/171897

no offers in the past month

http://bazaar.tf/trade/200361

a month at 3 (4, seller's wrap)

http://www.tf2outpost.com/trade/11320557

4 days at 3

http://www.tf2outpost.com/trade/11161808

a week at 3 (interest)

http://www.tf2outpost.com/trade/11279497

offer of 3!!

http://www.tf2outpost.com/trade/11367957

another offer of 3