Around 14 exist

6 month outdated price

Buyers:

https://backpack.tf/classifieds?item=Safe%27n%27Sound&particle=35 // Quickbuyers @ 10.47

Sellers:

https://marketplace.tf/shopitem/76561198054758757/178;5;u35 // @$30.27 (~13.5 keys)

https://backpack.tf/classifieds?item=Safe%27n%27Sound&particle=35 // 2 @ 14 keys

http://steamcommunity.com/market/listings/440/Unusual%20Safe%27n%27Sound // 3 @ Around 15k - 16k

Sold:

https://backpack.tf/profiles/76561198173442901#!/compare/1499472000/1499558400

Sold Smoking Safe'n'Sound (14k) + Mannrobics (~1.1k) for Bubbling Napper's Respite (~15k)

15k for 15k, rounding to the nearest 1k

Extra proof is highly appreciated. Also post any criticisms, thanks.