This is the new for 2012/fall "Sonic Plush with Sound Effects". It's a very small doll, about the size of the Jazwares small line plushes. It comes on a cardboard back-card (seen at left) so it can hang on a peg. That sticker on the belly dot says "Try Me". When you press it, the plush makes various game sound effects like 'getting a ring' and jumping. Notice the keychain style plastic clip on the top of the head.

These are available at Toys R Us, and should be about 8.99 or so when you find them. YES there is a Tails one but it is rather horrible. It's so bad in fact, that you have to go to Mutant Gear to see it! Oh no!

Would you like to hear the sound effects and see the doll in action? It may be small, and inexpensive, especially when you consider similarly sized plushes with no effects (JW) were running 9.99 to 10.99. However, Sonic's construction isn't that great...look at his wierd 'mono brow', giant nose, large lower face, modern package with classic type belly dot, 3 fingers??, and small round shoes. This is an Underground Toys item. 

Underground Toys made a slightly larger duo of talking dolls, but these sit in a little cardboard holder type box. They are about 10 inches tall, tops, so it's by no means a large plush. They make the same sounds the small ones do, but they look slightly better. The Sonic is classically proportioned, but has green eyes. His arms are sewn into the pose you see here.
The Tails is always a bit worse looking than the Sonic, & his head quality can vary. Some have long, thin, ant-eater like noses while this one doesn't. His bangs are a thick felt strip, & he is not sewn into a pose. These are available at Toys R Us in the USA and AcmeTrendz.com in the UK/Europe/ Denmark.