A few sales in keys, a few sales in buds. Most buyers and sellers are using keys for their prices. Suggesting in keys. <3 I've left out any Scatterguns with high-value parts or killstreaks unless it falls within or under the suggested range. All proof was gathered from the past few weeks.

Sold:

http://www.tf2outpost.com/trade/24256895 38 keys

http://www.tf2outpost.com/trade/24260269 39 keys

> http://backpack.tf/profiles/76561198069302006?time=1419580800

http://www.tf2outpost.com/trade/24020917 40 keys (specialized with 4+ keys of parts)

http://www.tf2outpost.com/trade/24253606 40 keys (specialized)

http://www.tf2outpost.com/trade/24169496 40 keys (screenshot: http://i.imgur.com/ZA6csdG.png )

http://www.tf2outpost.com/trade/24083769 41 keys

http://www.tf2outpost.com/trade/24189375 4 buds (41 keys B/O)

> Buds histories:

> 1. http://backpack.tf/item/119768380

> 2. http://backpack.tf/item/92950080

> 3. http://backpack.tf/item/92049097

> 4. http://backpack.tf/item/91736749

>

> Sale was on December 22nd (Buds were approximately 10.5 keys: http://backpack.tf/vote/id/549906a9b88d8862268b4e22 )

>

> Valued at 42 keys, but B/O was 41 keys.

http://www.tf2outpost.com/trade/24231824 4 buds (41 keys B/O; specialized)

> Buds histories:

> 1. http://backpack.tf/item/92986681

> 2. http://backpack.tf/item/95360564

> 3. http://backpack.tf/item/93659391

> 4. http://backpack.tf/item/165412303

>

> Sale was on December 23rd (Buds were approximately 10.5 keys: http://backpack.tf/vote/id/549906a9b88d8862268b4e22 )

>

> Valued at 42 keys, but B/O was 41 keys.

Summary of sales:

1 x 38 keys

1 x 39 keys

3 x 40 keys

3 x 41 keys

Sellers:

http://www.tf2outpost.com/trade/24363940 40 keys (3+ keys of parts)

http://www.tf2outpost.com/trade/23806776 47 keys (specialized)

http://www.tf2outpost.com/trade/24361518 48 keys

http://www.tf2outpost.com/trade/24346971 48 keys (specialized)

http://www.tf2outpost.com/trade/24351317 50 keys (specialized)

http://www.tf2outpost.com/trade/24340785 50 keys (specialized)

http://www.tf2outpost.com/trade/24328945 offers (offered 45 keys?)

Buyers:

http://www.tf2outpost.com/trade/24054253 35 keys

http://www.tf2outpost.com/trade/22217047 36 keys

http://www.tf2outpost.com/trade/24264758 36 keys

http://www.tf2outpost.com/trade/23150235 36 keys

http://www.tf2outpost.com/trade/24123518 36 keys

http://www.tf2outpost.com/trade/24223103 36 keys

http://www.tf2outpost.com/trade/23830352 36 keys

http://www.tf2outpost.com/trade/23296158 38 keys

http://www.tf2outpost.com/trade/23652342 38 keys

http://www.tf2outpost.com/trade/21333252 38 keys

http://www.tf2outpost.com/trade/23695822 38 keys + 9 ref

Classifieds:

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

Conclusion:

Most sales occurred at 40-41 keys. It should be safe to use that as the range. :3 Not a lot of current sellers at the suggested price, though I haven't found any valid sales at a higher price. 40-41 keys matches up with quickbuyer prices perfectly. ^.^