Many novelty stores like Spencer's Gifts and Hot Topic carry a wide selection of Harry Potter items, including sweaters, pins, scarves and a multitude of other miscellaneous items. More often than not, you can find many of these items in the clearance sections of the stores and/or on sale. There are also many sites online that you can order the merchandise from.
Amazon carries many items along with, if you're lucky, auction sites like Ebay. Sometimes, you can also find the merchandise at department stores such as Ross, TJ Maxx and Kohls, although if you go to any of these stores, you have to keep your eyes peeled, as things become very unorganized very quickly. Hope this helps!
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