I wanted to do Winnie pooh also for my nursery but its hard to find stuff of Winnie Pooh so I decided to go with safari with monkeys and giraffes
We decided to do the nursery in winnie the pooh. We bought the bedding at Babies rus. We decided to paint the characters on the wall because we couldn't find much for the walls. Then we bought the mobile from the Disney store website.
Im pretty sure Walmart has a winnie the pooh set
Babies r us has quite a few winnie the pooh bed sets. And accessories.