Updated submission to correct a few issues. Also found a better (read: Less complicated) mini for the Grenadier's Softcap.

New Invasion Unusual effect on a new Invasion cosmetic, but plenty of sales to establish a range! There are a few Buyouts on TF2Outpost currently set at 35 keys, hence the range's high point. It also falls in line perfectly with the highest sale, so that's always nice to see!

Here is my proof:

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Sale 1:

Galactic Codex Head Full of Hot Air and 6 pure keys were traded for a Vivid Plasma Grenadier's Softcap (37 Keys).

Total: (37 Keys - 6 Keys) * 0.9 (Overpay) = 27.9 Keys, rounded up to 28 Keys.

Buyer's BP Before: http://backpack.tf/profiles/76561198113673803?time=1445842800

Buyer's BP After: http://backpack.tf/profiles/76561198113673803?time=1446015600

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Sale 2:

Galactic Codex Head Full of Hot Air was traded 1:1 for a Knifestorm Handyman's Handle (39 Keys).

Total: 39 Keys * 0.9 (Overpay) = 35.1 Keys, rounded to 35 Keys.

Buyer's BP Before: http://backpack.tf/profiles/76561198087195582?time=1445670000

Buyer's BP After: http://backpack.tf/profiles/76561198087195582

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Sale 3:

Galactic Codex Head Full of Hot Air was traded for 21 Keys Pure, a Box Trot Taunt (1.2 Keys), and 52 Refined Metal (~3.25 Keys).

Total: 21 + 3.25 + ~1 = ~25 Keys.

Outpost Listing: http://www.tf2outpost.com/trade/27298921

Sale happened within 10 hours of the listing being created, so it classifies as a quicksale. This final amount is not being appropriated into the total range.

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Minis:

Vivid Plasma Grenadier's Softcap:

Total: 37 Keys

Seller's BP Before: http://backpack.tf/profiles/76561198090494957?time=1440226800

Seller's BP After: http://backpack.tf/profiles/76561198090494957?time=1440313200

Knifestorm Handyman's Handle:

There have been no recent sales on the Handle. The last sale involving the handle was used to price it 6 months ago. With the exception of moving the hat between accounts with no transactions, there has been no activity that can be used to document a change in price, except for the sale involving the Head Full of Hot Air. The price being used will simply be the price of the Handle from it's most recent suggestion, which is 39 Keys. If I overlooked a recent sale, please report it in the comments and I will adjust the suggestion and resubmit. From what I can tell, there are no recent sales on any of the clean Handles.

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If there are any other recent sale I have missed, or if I made any errors with the sales data or my calculations, please post them below and I will gladly factor them into the total price and resuggest!

Let it Scoot.