Too many available at 40 keys each, even a few at 39 keys.

I found 2 sellers on whole outpost who are selling for 41 keys, and both are unsold.

Selling at <40 keys

http://www.tf2outpost.com/trade/20023361 (38)

http://www.tf2outpost.com/trade/20018722 (39)

Selling at 40 keys:

http://www.tf2outpost.com/trade/20005969

http://www.tf2outpost.com/trade/19890268

http://www.tf2outpost.com/trade/20021732

http://www.tf2outpost.com/trade/19965542

http://www.tf2outpost.com/trade/19953517

http://www.tf2outpost.com/trade/19930699 (allied healing done)

http://www.tf2outpost.com/trade/19781838

http://www.tf2outpost.com/trade/19993775

http://www.tf2outpost.com/trade/20015292

http://www.tf2outpost.com/trade/20011900

http://www.tf2outpost.com/trade/20004723

http://www.tf2outpost.com/trade/19966392

Unsolds:

http://www.tf2outpost.com/trade/19715703 (2 weeks, probably changed price during those weeks though)

http://www.tf2outpost.com/trade/20011897 (young)

Conclusion: There are only 2 people selling on OP for 41 keys, and both are unsold. Most people end up selling their strange kritzkrieg for 40 keys or lower.