Most state university libraries are open to the public (some are actually required to be if they’re repositories of government documents). You’re free to browse

Most state university libraries are open to the public (some are actually required to be if they’re repositories of government documents). You’re free to browse when make use of their collections onsite. If you need borrowing privileges, these can in many cases be purchased from the institutions for between $1-300 per year. They generally don’t include offsite electronic resource access, but every university library I’ve worked for have computers with guest access to all of these materials. It’s a little pricey, but if you’re a regular consumer of academic or specialty literature, not at all a bad deal.