If you can find an unpainted sale at 3.5, I will personally get down and bow to you.

Apologies if there's any duplicate links.

Unsold at 3.1 - 3.5:

> http://www.tf2outpost.com/trade/16751651 (1 ref)

> http://www.tf2outpost.com/trade/16752017 (2 ref)

> http://www.tf2outpost.com/trade/16757136 (2 ref)

> http://www.tf2outpost.com/trade/16710244 (2 ref)

> http://www.tf2outpost.com/trade/16684015 (2 ref)

> http://www.tf2outpost.com/trade/16741852 (2 ref)

> http://www.tf2outpost.com/trade/16741852 (2 ref)

> http://www.tf2outpost.com/trade/16743966 (2 ref) (Olive)

> http://bazaar.tf/trade/608469 (3 ref)

> http://www.tf2outpost.com/trade/16754479 (3 ref)

> http://bazaar.tf/trade/605773 (3 ref)

> http://www.tf2outpost.com/trade/16742606 (3 ref)

> http://www.tf2outpost.com/trade/16708367 (3 ref)

> http://www.tf2outpost.com/trade/16585159 (3 ref)

> http://www.tf2outpost.com/trade/16642553 (3 ref)

> http://www.tf2outpost.com/trade/16656668 (3 ref)

> http://www.tf2outpost.com/trade/16682850 (3 ref)

> http://www.tf2outpost.com/trade/16682850 (3 ref)

> http://www.tf2outpost.com/trade/16756620 (3 ref)

> http://www.tf2outpost.com/trade/16729926 (3 ref)

> http://www.tf2outpost.com/trade/16709905 (3 ref) (Selling Multiple)

> http://www.tf2outpost.com/trade/16744044 (3 ref) (Lime)

> http://www.tf2outpost.com/trade/16742952 (3 ref) (Lime)

> http://www.tf2outpost.com/trade/16735434 (3 ref) (Gold)

> http://www.tf2outpost.com/trade/16729471 (3 ref) (Violet)

> http://www.tf2outpost.com/trade/16737740 (3 ref) (Lime)

> http://www.tf2outpost.com/trade/16645208 (3 ref) (Muskel)

> http://www.tf2outpost.com/trade/16709905 (3 ref) (Painted) (Selling Multiple)

> http://www.tf2outpost.com/trade/16495601 (3.22 ref)

Unsold at 3:

> http://tf2tp.com/trade.php?trade=9957904

> http://www.tf2outpost.com/trade/16750060

> http://www.tf2outpost.com/trade/16740600

> http://www.tf2outpost.com/trade/16703487

> http://www.tf2outpost.com/trade/16598471

> http://www.tf2outpost.com/trade/16530958

> http://www.tf2outpost.com/trade/16723522

> http://www.tf2outpost.com/trade/16578981 (Selling Multiple)

> http://www.tf2outpost.com/trade/16756451 (Orange)

Sold at 3.5:

> http://www.tf2outpost.com/trade/16721534 (Rustic)

> http://www.tf2outpost.com/trade/16695137 (Rustic)

Sold at 3:

> http://www.tf2outpost.com/trade/16745486

> http://www.tf2outpost.com/trade/16737097

> http://www.tf2outpost.com/trade/16710864

> http://www.tf2outpost.com/trade/16239523

> http://www.tf2outpost.com/trade/16598471

> http://www.tf2outpost.com/trade/16717841

> http://www.tf2outpost.com/trade/16527159

> http://www.tf2outpost.com/trade/16722804

> http://www.tf2outpost.com/trade/16745303

> http://www.tf2outpost.com/trade/16722804

> http://www.tf2outpost.com/trade/16699587

> http://www.tf2outpost.com/trade/16700033

> http://www.tf2outpost.com/trade/16703487

> http://bazaar.tf/trade/604502

> http://www.tf2outpost.com/trade/16719487

> http://www.tf2outpost.com/trade/16724664

> http://www.tf2outpost.com/trade/16745303

> http://www.tf2outpost.com/trade/16740469 (Lime)

> http://www.tf2outpost.com/trade/16704316 (Gold)

> http://www.tf2outpost.com/trade/16693282 (Rustic)

Other:

> http://www.tf2outpost.com/trade/16631586 (Backpack.tf Price)

> http://backpack.tf/classifieds/search/id/520071654bd7b8d00100000b/1 - 6 Unsold for 3.5

> http://backpack.tf/classifieds/search/id/520071654bd7b8d00100000b/1 - 10 Painted Unsold for 3.5

> http://backpack.tf/classifieds/search/id/520071654bd7b8d00100000b/1 - 9 Unsold for 3

Conclusion: There's tons of 3.1 - 3.5 sales, even some with reasonable paints. Nearly all of these are unsold and have been for a while. 3 keys however, has a reasonable amount of sellers and most of the time sells within 24 hours.

Feel free to add to or counter this.