Try the Dollar Spot at Target. They often have Disney themed items (like socks) and sometimes they clearance that stuff out too. (Over the summer DD11 had a Wizards of Waverly Place Party and Target was clearancing out the Dollar Bins-I picked up 3 packs of WoWP pens, notebooks, Rock Star bath gels, and something else for for $0.50 a piece. Each goody bag cost me very little and they were stuffed.
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Also, check Target/Walmart for their after Halloween sales. I know Target has some silly putty in the Halloween section, cars, Polly Pocket, other little things like that and those will be clearanced. With a lot of that take off the packaging and you/kids won't know it was the Halloween stuff. Last year I bought these squishy things (that silicone stuff and they had googly eyes) that when you hit them a flashing light would come on. Came in a three pack of green, purple and orange. Put the purple one in DD's stocking, DS got the green one and the extra went...somewhere. Kids have no idea I got them on clearance after Halloween.
HTH