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Yes, there are agents/brokers that will for a fee provide a service to obtain seller's permits in the various states. Please note that some states may not require seller's permits, such as Alaska, New Hampshire or Oregon.
Following for your information review is a direct link to a website that provides the services as well as a write-up on legal guidelines for seller's permits:
Although I cannot recommend an agent or broker, following is another link to a service that provides seller permits for the various states:
You may want to check out the above services through the Federal Trade Commission, Better Business Bureau or an online search of their names and services to ensure that you will be comfortable and satisfied with the services and fees.
You may also want to contact your state's trade development office to determine whether that office may assist you in obtaining permits for other states as you develop your business. Often the state development offices like to see businesses expand and may have other resources to assist your efforts.
You may also find it helpful to contact your local SCORE chapter, Counselors to America's Small Business, at:
SCORE's Free volunteer business executive counselors may be able to assist you with other resources and business plans as well.
I hope the above information is helpful and responsive. If you would like further clarification, please let me know.