Rarity:

in the wild: 23

for sale on OP: 5

TF2PC consensus: 4.5-5

http://www.tf2pricecheck.net/Thread-PC-Burning-Flames-Safe-n-Sound

Active trades:

http://www.tf2outpost.com/trade/7743403

Refused:

-Ghost bubble pipe (7-9) for SNS + 3 buds (~5)

http://www.tf2outpost.com/trade/7717506

refused:

-Searing Bubblepipe (~4)

http://www.tf2outpost.com/trade/3065207

-knifestorm killer's kabuto (! PC'd @ 7.3-10 here)

-Cloudy sack + bmoc + black bills (~4)

http://www.tf2outpost.com/trade/1794494

-NNB barnstormer (~5)

http://www.tf2outpost.com/trade/7689072

B/O 5 buds (more in unusuals)

**This confirms the top end since it's the lowest b/o.

All those refused 4-5 offers confirm 4 is too low. So it's 4.5-5 in my book.