A funeral home will usually charge more if they need to send more than one person for a collection. This means that cases where the person is over a certain weight, or that take place in a private residence, are likely to be more expensive.
There are also some costs that a funeral home has no control over - namely coroner fees and death certificate fees. Coroner fees are usually calculated by the number of days a person is with them - a good reason to make a decision as soon as you can. Death certificates are ordered through the county. Some companies, like Tulip, will be able to order them on your behalf.