Influencers princing varies depending on several factors :
- their willingness to participate in the project and their appeal to the brand,
- their popularity and the size of their community - the bigger the community, the more expensive the influencer,
- the type of content required: long and/or fix content are more expensive than short and/or temporary content.
To give you an idea, consider $20 per CPM on Instagram and $40 on Youtube.