Where can i buy authentic toy story merchandise?

The evidence available only describes Buzz Lightyear as a fictional character in the Disney‑Pixar Toy Story franchise and does not mention any retail locations, official stores, or online platforms that sell authentic Toy Story merchandise. Because there is no documented source giving details about buying options, no specific recommendation can be made. If you are looking for official merchandise, you might consider checking Disney or Pixar’s official websites or licensed retailers, but that suggestion is not supported by the cited sources.