Resubmitting with an even more accurate range.

Sales: (using original unusual prices/overpay)

http://www.tf2outpost.com/trade/15492762

Sold for a clean Max's Head (2.4 buds)

History of the Max's Head: http://www.tf2outpost.com/item/440,2056898964

http://www.tf2outpost.com/trade/15541871

Sold for a Green Black Hole Berliner's Bucket Helm (Original price: 2.5-3 buds~2.75x.9=2.47=2.5 buds)

Current owner of the PE Birdcage added the guy who offered said PE Birdcage on the GBH Helm.

History of the Helm: http://www.tf2outpost.com/item/440,2069107314

History of the BIrdcage: http://www.tf2outpost.com/item/440,2069107424

http://www.tf2outpost.com/trade/14850227

Quicksold for 30 keys (Irrelevant use in this suggestion as quicksales cannot be used as proof when setting a price, but including it nonetheless.)

As proof shows, the Birdcage sells at a tight range, disregarding quicksales. All the kinks in the two previous suggestions have been ironed out to solidify an accurate range.