Special thanks to Shrewd who helped me greatly with this suggestion!

Proof below - So I'm joining the Update The Nano Club, so here goes. 3 of these exist, 2 on the market. Not counting sales over 2 months old.

Current trades - Notable offers listed below

http://www.tf2outpost.com/trade/13859452 B/O 3 buds, no notable offers. By the looks of things this isn't a quicksell price considering the hat has been on sale for 1 month now.

http://www.tf2outpost.com/trade/14611038 No B/O, no notable offers

Sales

http://www.tf2outpost.com/trade/12448480 - For Burning Flames Shooter's Sola Topi ~ 3 buds - http://www.tf2outpost.com/trade/12474552

A bit old but fits well into the new range.

http://www.tf2outpost.com/trade/12497077 - For between 50-59 keys ~ 3 buds

Can't confirm the exact amount of keys. Checked the history of the trade owners backpack but the no. of raw keys just went from 84 to 0 but the history on the listed keys in the trade went to the Nano owner.

http://www.tf2outpost.com/trade/13711141 - For Stormy Storm Titanium Tyro ~ 2.4 buds - http://www.tf2outpost.com/trade/13849961

http://www.tf2outpost.com/trade/13849956- For Blizzardy Storm Ushanka ~ 3.2 buds - http://www.tf2outpost.com/trade/13870435

Outliers or unidentifiable

http://www.tf2outpost.com/trade/12955778 - For Green Black Hole Nano ~ 2.8 buds + unknown sweets (added by trade owner)

http://www.tf2outpost.com/trade/13660823 - For Memory Leak Salty Dog? ~ 1.3 buds

http://www.tf2outpost.com/trade/13947447 - For Time Warp Torque ~ 5.5 buds - http://www.tf2outpost.com/trade/14347602

Low-end: 1 confirmable sale

High-end: 1 confirmable sale

3rd sale and current buyout also fit well into the range.