Arda wigs sells wigs that fit a larger american style head size. They should have something in cherry red that will work for that char. Also try epiccosplay.com since they have free shipping right now.
Both are reliable US sellers with excellent customer service that sell only high quality heat resistant products. Arda wigs are a bit thicker and fit a slightly larger head size, Epic wigs are tangle free in the long styles and a much softer fiber, both have advantages depending on what you need. They're the two places I always look first. ^^