There are many places where one can purchase oilskin from. One can purchase oilskin from popular on the web sources such as Amazon and Oilcloth By The Yard.

Vintage oilskin dusters are lovely jackets that can be purchased on ebay. The price of the vintage oilskin duster (depending on the quality) is upwards of $50.

Driza-bone is an Australian company that manufactures oilskin clothing such as coats, jackets, pants, bags, and other non-oilskin products such as shirts and t-shirts for rugged outdoor wear.

The book in the oilskin packet in Treasure Island contains the key to Captain Flint's treasure buried on the island. It holds crucial information on where the treasure is hidden and serves as a central plot device for the story, driving the characters' actions and motivations to find the treasure.

Driza Bone is an Australian company that specializes in the manufacture and sale of mens clothing. They produce rugged hard-wearing clothes from fabrics such as oilskin, denim, wool and cotton. They are particularly renowned for their selection of oilskin coats and jackets, but also produce shirts, jumpers, underwear and accessories.