Both Sonic and Tails also have cheaper and more expensive options just like Shadow, both of which also include four-in-one voice chips. Tails' plush doesn't appear to include an accessory ...

Sonic the Hedgehog ... into the Shadow plush: a four-in-one voice chip. It costs an extra $8, but you will have Keanu Reeves' voice saying iconic lines such as “Just try to keep up.” ...