Just came back yesterday, visited Epcot Saturday.
I made a point of stopping at Mitsukoshi and check the Ghibli merchandise like I do every trip.
They had Totoro plushies, jigsaw puzzles, stationery, Ponyo stationery, models of the homes featured in Howl's Moving Castle, Spirited Away and I believe Totoro and Ponyo.
They also had fine china with the characters of Totoro on them, really cute I might add.
I purchased a Kiki's Delivery Service music box (I found a picture online):
The cats move when the music plays, very nice collector's item.
They used to have Ponyo plushies as well. I was too busy looking at art books and the models to pay much attention (sorry), they might still have them.
If you want to buy the Totoro plush dolls Ebay and
Amazon carry them, sometimes at much cheaper prices.
Edit: Forgot to add that I saw soundtrack CD's for most if not all Ghibli movies and a lot of art books.