Conservative bump up, found a sale

Sold for Knifestorm Festivizer (3.4, was offered) + 1 bud 18 keys (1.9 buds, buds were 19) ~ 5.3 buds:

http://backpack.tf/profiles/76561198022288394?time=1398322800

Rough estimation on the price of the knifestorm festivizer

Sold for a harvest sola topi ~ 4 buds:

http://www.tf2outpost.com/trade/19083611

Sold together with KaW SnS + Hearts AA (both quicksold for 5.5 in total) for a duped hearts bonk boy (putting at 9) - 3.5 buds:

http://www.tf2outpost.com/trade/19311877

Note: while the price of the festivizer is outdated, none others had appear in the market. Seeing how the festivizers are hyped now, 3.75 buds for the festivizer might be low as well.