The Japanese manufacturer KCompany, who frequently makes plush and collectibles of anime and manga licenses, has officially started a line of My Little Pony plush. The complete mane 6 is part of this first wave of plush, each available in two variants: a sitting pose that's 3.3" (8.5cm) tall and a standing version that's 4.7" (12cm) in height. All ponies have chibi eyes and cutie marks on both sides, and the standing ponies have a keychain hook and charm based on their element.
Price wise these ponies are a bit on the high side: the smaller sitting plush are 1049 yen ($9.27) and the standing ponies are 1379 yen ($12.19).
You can get these plush at the online retailer Rakuten or in various local anime/manga shops. Whether you're able to get it or not, enjoy more images of the ponies below!
Thanks to Stinken1 and Ayu for the info!