This is my first suggestion, so please don't be harsh.

Only ~20 trades on Outpost, most people are selling as a set of crates.

Sellers:

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http://www.tf2outpost.com/trade/13591459 5 Ref

http://www.tf2outpost.com/trade/21203358 5 Ref

http://www.tf2outpost.com/trade/21642965 5 Ref, bit young

http://www.tf2outpost.com/trade/21625318 5 Ref

http://www.tf2outpost.com/trade/12173013 Sold for 5.66 Ref

http://www.tf2outpost.com/trade/21546144 Wants 6 Ref

Some people selling for a Key each, i'll assume they're not getting much action.

Outliers:

http://www.tf2outpost.com/trade/20952015 1 Key ea.

http://www.tf2outpost.com/trade/14576244 1 Key ea. <--- Getting Adds

http://www.tf2outpost.com/trade/21456423 1 Key

http://www.tf2outpost.com/trade/21012967 1 Key ea. (Sold 3)

http://www.tf2outpost.com/trade/21633940 1 Key, No Notes

http://www.tf2outpost.com/trade/7825039 10 Ref according to his Spreadsheet

Rest are selling as Sets.

Buyers:

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http://www.tf2outpost.com/trade/21383745 2.66 Ref

http://www.tf2outpost.com/trade/19636998 2 Ref

http://www.tf2outpost.com/trade/21627129 1 Key for 3 crates

http://www.tf2outpost.com/trade/21117328 Taking offers, recent seller for 2.66

http://www.tf2outpost.com/trade/21122205 2 Ref

http://www.tf2outpost.com/trade/21030198 2 Ref, bought 14

http://www.tf2outpost.com/trade/19721711 .33 (lol)

http://www.tf2outpost.com/trade/21605010 2 Ref

http://backpack.tf/stats/Unique/Mann%20Co.%20Supply%20Crate/Tradable/Craftable/1

Classifieds at time of posting:

1 for 4.66 Ref

3 at 5 Ref

1 at 6 Ref

1 at 1 Key

In summary, the Buyers go by the current price, or are lowballers, while the Sellers are selling at a couple Ref higher than the current price, even some are at a Key. Like I said, first suggestion, so if I dun goofed, please don't hurt me.