The following business email lists are some of the common ones used by businesses to market their services. While optin email list brokers can help procure such business email lists, beware of the many scams out there claiming to offer cheap optin lists. They usually are not genuinely opted in, and even if they were legitimately opted into one list does not necessarily mean they granted permission for you to email them. It's possible...but not likely.
You will always get a better response from a list you develop yourself, or one which you hire an optin email list development company to build for you. The reason is simple: Relationship. The more of a relationship you or your business has with the end reader, the better response you will get from your business email lists.