The pre-order page for Mareep goes into more detail:
- Measures about 24 inches tall and 40 inches long—matches Mareep's height listed in the Pokédex
- Material has a supersoft woolly, fluffy texture
- Giant-size plush makes a big impression
- Pokémon Center Original design
They will be taking pre-orders until September 1st. It will start shipping in Japan in December 2019 and January 2020 in the US.
US PokeCen - $500
JP PokeCen - 41,800 yen