Solds-

http://www.tf2outpost.com/trade/23579174 - 31 Keys (2 buds)

http://www.tf2outpost.com/trade/23174908 - 30 Keys (1.9 buds)

http://www.tf2outpost.com/trade/22577763 - Vivid Tree (2.8 * 0.9 = 2.5) + 6 keys ~45 keys (2.9 buds) (Outlier)

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Sellers-

http://www.tf2outpost.com/trade/23537661 - Considering Logo Topi (18 * 0.9 = 16 keys) + 1 bud ~2.1 buds

http://www.tf2outpost.com/trade/22631793 - Assimov AWP B-S + C9 Conquistador (16 * 0.9 = 14 keys) ~2 buds

(I dont really know the CSGO prices but I think the AWP is roughly 16 keys including overpay.)

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ALL MY MATH ARE ROUNDED