There is no definitive answer to this question as hybrid publishers can vary greatly in their pricing structures. Some may charge a traditional publishing fee, while others may operate on a purely profit-sharing basis. Still others may offer a variety of pricing models, depending on the particular project.
One important factor to consider is the level of services provided by the hybrid publisher. For example, if they offer a comprehensive package that includes editing, design, marketing, and distribution, you can expect to pay more than if you were to work with a publisher who only handles some of these aspects.
Another thing to keep in mind is that hybrid publishers are often more willing to negotiate on price than traditional publishers. So, if you're looking to save money, it's worth asking if they're open to negotiating a lower fee.
Ultimately, the best way to find out how much a hybrid publisher charges is to contact them directly and ask for a quote.
