Billboard Impression cost:
Dec 1, 2023 - The average billboard cost in the U.S. is $66,773 for a four-week campaign, and varies based on ad format, circulation, demographics, and impressions.
Link: https://fitsmallbusiness.com/how-much-does-billboard-advertising-cost/

Radio Impression, production, etc. cost:
July 7, 2023 - Radio advertising costs average from $200 to $5,000 per week depending on location, ad length, and size of the listening audience.
Link: https://fitsmallbusiness.com/radio-advertising-costs/

Print Media:
As low as a few hundred dollars for a single ad in a single paper, magazine, etc. - possibly lower if it has "gone to digital."

For National Papers, Magazines, and other top level publications, a single ad tops out at around $500K!