Easy to sell it for 3.33

Buyers for 3.33

http://www.tf2outpost.com/trade/9044598

http://www.tf2outpost.com/trade/8897539

Unsuccessful buyers at 3 ref

http://www.tf2outpost.com/trade/8896208 - 6 days

http://www.tf2outpost.com/trade/8990702 - 2 days

Now let's move to seller's section

http://www.tf2outpost.com/trade/9012057 - Got an offer of 3.66, not taking 3 ref offer

http://www.tf2outpost.com/trade/9011236 - Sold it for a key

http://www.tf2outpost.com/trade/8594759 - Sold for around 3.66

http://www.tf2outpost.com/trade/8790072 - Offered Stash (3.44)

http://www.tf2outpost.com/trade/9030658 - Selling/Sold for 3.33

Unsold at 1 key

http://www.tf2outpost.com/trade/8841864

http://www.tf2outpost.com/trade/9019802

Looks like no one is selling it for 3 ref anymore. You can easily sell one for 3.33. Some even offer 3.66 or a key but I'm not going to put 1 key as high value because some are still unsold. Therefore 3.33~3.66 seems good.