[1 HP] called it. Counter-suggestion: http://backpack.tf/vote/id/52c6fb494cd7b8b67e8b45e6 -

Original values of unusuals used and overpay applied when necessary. Buds and keys at what they were time of sale

Proof #1

http://www.tf2outpost.com/trade/16899032

Sold for a Purple Energy Ze Goggles (2.7) + 1 bud 5 keys (1.3) ~ 4 buds

Total: ~4 buds - the PE Goggles are outdated to shit. 10 months old

Proof #2

http://www.tf2outpost.com/trade/16037372

Sold for a Time Wrap Prancers (~2.3) + Bubbling Nappers (~1.2) + Bubbling Gatsby (~0.8)

Total: ~4.3 buds

Proof #3

http://www.tf2outpost.com/trade/14924745

Sold for 4 buds pure

Total: ~4 pure buds

Proof #4

http://www.tf2outpost.com/trade/14416126

Sold for 3 Buds + 16 keys + ~4 keys in sweets

Total: ~4 buds

http://www.tf2outpost.com/trade/16656490

Sold for a (duped) Peace Sign Stahlhelm (~3.5) + 1 bud

A Surgeons Stahlhelm for 3.5 buds on Classifieds:

http://backpack.tf/classifieds/search/id/520003c5ba2536a320000000

http://www.tf2outpost.com/trade/16825880

Total: ~4.5 buds

Currently on Outpost: 11...

http://www.tf2outpost.com/search/180757363

One asking for 5

Two asking nothing below 4

One asking ~4.5-4.6

Conclusion

Going by a longshot, I think that the Stahlhelm sale should be valued at ~4.5, as there is currently a Stahlhelm on the market for 3.5 buds. With overpay, the Stahlhelm sale would result in 4.7 buds either way, not 5 buds, using the correct form of overpay (avg. original price * 0.9). The PE Goggles are too outdated to count. Not like that effects the price anyways, with sales at 4 buds as well. Any Extra Proof/Cunter-Proof/Opinions/Tips/Help is all welcome. Thanks for reading. Feedback is always appreciated.