Sales up to 38 keys and several sales at 35 keys, but no current sellers under 3 buds (37.5 keys)—suggesting a conservative increase.

Sales:

http://www.tf2outpost.com/trade/24947512 35 keys

> http://i.imgur.com/idWGJp2.png

http://www.tf2outpost.com/trade/24921854 35 keys

> http://i.imgur.com/HfI6SRa.png

http://www.tf2outpost.com/trade/24948529 35 keys

> http://i.imgur.com/PQIqVE3.png

http://www.tf2outpost.com/trade/24948135 35 keys (Specialized)

> http://i.imgur.com/KVoV6Vd.png

(No Outpost Trade) 36 keys

> http://i.imgur.com/AFXA0QH.png

http://www.tf2outpost.com/trade/21695075 36 keys

> http://i.imgur.com/JvptjxN.png

http://www.tf2outpost.com/trade/24897793 36 keys

> http://i.imgur.com/N6tA4uT.png

http://www.tf2outpost.com/trade/24955225 37 keys

> Searing Geisha (~15 keys after overpay) + 22 keys + 3 gift wraps + ~2 keys in items/metal

> ~42 keys, but B/O was 37 keys

http://www.tf2outpost.com/trade/24958929 38 keys

> Clean Max: http://backpack.tf/item/75054377

> ~41 keys, but B/O was 38 keys

http://www.tf2outpost.com/trade/24879506 38 keys; 2 buds + 13 keys (Specialized)

> http://backpack.tf/profiles/76561198131693485?time=1423209600 -> http://backpack.tf/profiles/76561198131693485?time=142329600

http://www.tf2outpost.com/trade/24958929 39 keys (Specialized)

> http://i.imgur.com/XQ9nuRo.png

> Ignore the trade notes, I was asking for 40 keys.

Sellers:

http://www.tf2outpost.com/trade/24950800 37.5 keys / 3 buds

http://www.tf2outpost.com/trade/24971711 37.5 keys / 3 buds

http://www.tf2outpost.com/trade/24972878 37.5 keys / 3 buds (Specialized)

http://www.tf2outpost.com/trade/24986354 38 keys

http://www.tf2outpost.com/trade/24958929 38 keys

http://www.tf2outpost.com/trade/24970943 38 keys

http://www.tf2outpost.com/trade/24987369 38 keys

http://www.tf2outpost.com/trade/24966706 39 keys

http://www.tf2outpost.com/trade/24973392 39 keys

http://www.tf2outpost.com/trade/24950835 39 keys (Specialized)

http://www.tf2outpost.com/trade/24899480 40 keys

http://www.tf2outpost.com/trade/24894694 40 keys (Specialized)

Offers:

http://www.tf2outpost.com/trade/24894694 Declined 37 keys collecting (Specialized)

http://www.tf2outpost.com/trade/24876569 38 keys C/O; Declined 36 keys (Specialized)

Notable Buyers:

http://www.tf2outpost.com/trade/24982463 33 keys

http://www.tf2outpost.com/trade/23817639 33 keys

http://www.tf2outpost.com/trade/21333252 34 keys

http://www.tf2outpost.com/trade/24873030 34 keys

Classifieds:

http://i.imgur.com/bg8ccgP.png

1 x 34 keys

6 x 38 keys

2 x 39 keys

1 x 40 keys