Update: After a leak that Eevee was getting its own Tamagotchi, the Japanese Tamagotchi website has officially confirmed the release, which can be raised into one of eight evolutions.
The Tamagotchi will be available in two design options: “I love you, Eevee” and “Colorful friends.”
So far there is only a release date for Japan, which will be on Jan. 26, 2019. The Tamagotchi will cost 2,300 yen or approximately $20 USD.
Source: IGN.com Update: Eevee Tamagotchi Confirmed, Marks First Official Pokemon Tamagotchi