Obi loves to play fetch, and now that it's so cold outside we do it mainly inside. His favorite toys to play fetch with are a couple of soft items from Petstages, the Soft Toss Ring and the Mini Loop Ball. I think you can find both of these at PetSmart, but am not sure as I got them as a gift from a friend who works for the company.
Below are links to the 2 products.
Petstages - Developmental Toys for Dogs - Interacting - Soft Toss Ring Petstages - Developmental Toys for Dogs - Mini - Loop Ball