Where can i find toy story merchandise at fan conventions?

Based on the verified sources supplied, there is no information about the availability or location of Toy Story merchandise at fan conventions. The only confirmed fact is that 'Toy Story' is a known entity in the knowledge graph, and a Wikipedia article about the narrative device of a story within a story was provided, which does not address merchandise or conventions. Because the evidence does not cover this specific question, we cannot provide a definitive location or vendor list. If you are looking for Toy Story merchandise at fan conventions, you would need to consult additional, reliable sources such as official convention guides, vendor listings, or the official Toy Story or Disney websites. Until such information is verified, we cannot confirm where or how to obtain these items.