There are less than one page of these on outpost.

Sellers at 4.75 and below:

[url]http://www.tf2outpost.com/trade/11349415[/url] 4 + 2.33

[url]http://www.tf2outpost.com/trade/11260174[/url] Willing to accept 3 keys?

[url]http://www.tf2outpost.com/trade/11463748[/url] "at least 4 keys for the blood botkiller"

Not too many on the market for 5:

[url]http://www.tf2outpost.com/trade/11430025[/url]

[url]http://www.tf2outpost.com/trade/11270657[/url] 6 days, but unbumped for 10 hours

And of course, the classifieds:

[url]http://backpack.tf/classifieds/search/898/11/0[/url] One for 4, then the rest are overprices/come with parts.

Why leave 5 in the range?

- Several of the sellers at 5 keys on outpost are unbumped/too recent. Leaving 5 keys in range because of the possibility of it still being possible, just more likely a saturated price.

2 on classifieds for 4 keys now.