Classifieds at the time of posting this suggestion.

Unsolds are based on how long the listing has been up; Listing has been up 5 days and item been in the sellers inventory for 8 days? It has been unsold for 5 days.

The age of the listing(s) are shown in the screenshots rather than the last bump.

x4 for sale at 3.66 Refined - http://i.imgur.com/aRIl8fm.png

Unsold for 2 days http://backpack.tf/item/2683689051

Unsold for 1 day http://backpack.tf/item/847332063

Unsold for 2 days http://backpack.tf/item/2990310932

Unsold for 5 hours http://backpack.tf/item/684113979

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x2 for sale at 3.77 Refined - http://i.imgur.com/8y4zqAK.png

Unsold for 4 days http://backpack.tf/item/639771834

Unsold for ~1 day http://backpack.tf/item/721262164

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x2 for sale at 3.88 Refined - http://i.imgur.com/3njfqEJ.png

Unsold for 8 days http://backpack.tf/item/1303277574

Unsold for 3 hours http://backpack.tf/item/2436784399

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x2 for sale at 4 Refined - http://i.imgur.com/AbbE78C.png

Unsold for 2 days http://backpack.tf/item/730393922

Unsold for 11 days http://backpack.tf/item/725208801

Outpost sellers.

http://www.tf2outpost.com/trade/28340055 - 4 Refined - Unsold for 5 days.

http://www.tf2outpost.com/trade/28333742 - 4 Refined - Unsold for 1 week.

Everything else on Outpost are priced higher due to Killstreakers, Spells, Strange Parts etc...