Marathon Handbook reports on 19 U.S. marathons with entry fees under $100. The Paavo Nurmi Marathon in Hurley, Wis., at $45, is the cheapest. It runs along Highway 77 and has been held since 1969.

The Stennis Space Center Marathon in Mississippi costs $50 until Nov. 22. It is a single loop around the NASA facility and is a Boston qualifier. Participants need a Real ID or passport and proof of car insurance. Read more racing coverage.

Other affordable marathons include the Pocatello Marathon in Idaho at $60 until Feb. 14, and the Atlantic City Marathon in New Jersey at $85 until Oct. 31. Both offer USATF-certified courses. Related: U.S. Marathon Mishaps Highlight Canadian Race Rule Changes.

This original Runner World brief is based on reporting from Marathon Handbook. Visit the source for its complete reporting, context and any later corrections.