Three Barrel Cove along with Pirate Bandana and Three Cornered Hat are mentioned in the weekly sales ad but these items are not discounted in the store.

DDO Store Sales 9/16-9/22
http://www.ddo.com/ddostoresale

Three-Barrel Cove Adventure Pack
Explore the dangerous island of Three-Barrel Cove and discover the dark secrets
hidden in this pirate paradise! Includes 9 hand-crafted adventures, a full-service
tavern and 41 wilderness area objectives!
Account > Adventures > Adventure Packs > Low Level
 4-7

650
423

Pirate Bandana
Wear this and look like a pirate! This sturdy Scallywag's Cap bandana
has a look that any pirate would be proud of and gives you a +10 competence
bonus to the Haggle skill when worn.
 Cosmetics > Cosmetic Gear > Hats & Helms
All


150
75

Three-Cornered Hat
This naval Three-Cornered Hat can be worn by itself or can temporarily
change the appearance of your current helmet and can then be toggled off again.
 Cosmetics > Cosmetic Gear > Hats & Helms
All


95
48