I see that potentially the clean version could have a lower range, much lower than the dirty one. Maybe this 1 month old price needs a refresh.

Unsold 2.66 ref

http://www.tf2outpost.com/trade/12681388 high price is 2.66 ref, no offers or sales. 1 week.

^ The only seller for 2.66 I could find.

Was offered 2.44, 1 month ago (a fairly long time ago).

http://www.tf2outpost.com/trade/11856860

Selling for 2 ref

http://www.tf2outpost.com/trade/13041212

Selling for 2.33 ref

http://www.tf2outpost.com/trade/13013281

http://www.tf2outpost.com/trade/12940778

http://www.tf2outpost.com/trade/12924402 low price is 2.33 ref (technically selling it for 2.33)

Bought for 1 ref

http://www.tf2outpost.com/trade/11176269

^ The only successful buyer.