Google: you can use the keywords: wholesale wigs, wig vendor, wig supplier, wig factory, wig manufacturer (you can add locations like China to find specific location supplier).

Alibaba: One of the easiest ways to find wig suppliers.

Facebook group: You can find real opinions about a wig company in a Facebook group. People may share their sourcing experiences in a FB group.

Instagram: Search for the same keywords or brainstorm to try more keywords, Instagram will show you a list based on your searching.

There are many other ways you can find a wig supplier, but the above should be enough.

Find a wig supplier is easy, evaluating them is the most important part. A supplier provides you both good quality hair and support is what you need.