Team Fortress 2
Counter-Strike: Global Offensive
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Old halloween effects on newer hats are sexy.
http://www.tf2outpost.com/trade/22477792 - Sold + 18 keys (approximately 1 bud time-shifted) for a Stormy 13th Hour Brigade Helm (7.7 * 0.9 = 6.93 rounded to 6.9 - 1 = 5.9 buds). All of the keys can be found at: http://backpack.tf/profiles/76561198063794921?time=1410159600
http://www.tf2outpost.com/trade/22036880 - Sold for a Burning Flames Cockswain's Pith Helmet (6.6 * 0.9 = 5.94 rounded to 5.9 buds, see mini-suggestion below).
Burning Pith Helmet Mini-Suggestion:
Only one sale to work with. All others use outdated hats.
http://www.tf2outpost.com/trade/21633038 - Sold for a Poisoned Shadows Stainless Pot (5.65, Pith was offered so no overpay) + 17 keys (0.9 buds at the time), so 6.55 rounded to 6.6 buds.