More on the collectibles side, but try Disneyana at the beginning of Main St in DL, Off the Page in DCA, and Wonderground Gallery in DTD. Some items are pricey, but I've also found beautiful pieces under $50, as well.
I had better luck in DCA. I found some cute things in that store that wraps around the end of the corner towards Hollywood land at the bottom the main entrance walkway there. The one that usually has purse displays.
I have to assume you'd be able to find pins somewhere. Also, not merch, but don't forget about the lamp that's in the back of the bazaar in Adventureland.
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