The Indiana University Law Library has drafted a comprehensive state-by-state guide to legislative history resources.
This resource lists, by state, alphabetically, resources available. This includes links to the state legislatures, research guides, and other academic, governmental, and commercial sources. Contact info for state archives and date ranges available are also listed.
As with any resource involving multiple states, the quality and availability of resources varies considerably by state. Florida's resources, for example, focus exclusively on guides by librarians whereas Illinois's has information by their legislature and state bar association.
If you still have questions or problems after checking this source, please come talk to me. There are several additional steps we can take together to get more information.