Proof below (8 sales). Overpay is applied.

Small bump to 7 month-old price.

Prices used are of time of sale.

1st sale:

http://www.tf2outpost.com/trade/12741451 sold for strange gunslinger+strange pda=~1.3 buds

2nd sale:

http://www.tf2outpost.com/trade/12697926 sold for 1.1 buds (24 keys), had 1.3 bud offer after it sold

3rd sale:

http://www.tf2outpost.com/trade/13046345 sold for stormy fez+genuine shred alert+nine pipe problem=~2.1 buds, clear outlier

4th sale:

http://www.tf2outpost.com/trade/12569901 sold for bubbling reggaelator+vintage cola+grimme hatte=~0.9 buds (20 keys)

5th sale:

http://www.tf2outpost.com/trade/14106325 sold for ~1.4 buds (1 bud+9 keys)

6th sale:

http://www.tf2outpost.com/trade/13998375 sold for ~1.4 buds (1 bud+8 keys)

7th sale:

http://www.tf2outpost.com/trade/13849032 sold for ~1.1 buds (1 bud+3 keys)

8th sale:

http://www.tf2outpost.com/trade/13617751 bought of gatsby=~1.1 buds going by trade's prices, seen here: http://www.tf2outpost.com/trade/13647330

Sales: 0.9, 1.1, 1.1, 1.1, 1.3, 1.4, 1.4, 2.1

The 2 extreme sales definitely look like outliers, and the rest of the sales are included in the suggested range.