Texture pack DLC

In the Bedrock Edition, Legacy Console Edition & New Nintendo 3DS Edition, texture packs are available as downloadable content that can be bought from the Xbox 360 or One marketplace/Playstation store/Nintendo eShop or from the downloadable content section of the game, in addition to the default texture pack that come with the game. Texture packs usually cost each or equivalent to, however trial versions are available.

Community texture packs
In Pocket Edition, Minecraft Marketplace allows community creators to sell their texture pack with various prices (provided they're a registered company). A complete list of community texture packs can be found in the in-game store.