Private car sale brokers

Hear me out. Does anyone know of a service where someone will broker a private sale of a car? Ie, I don't want to take the hit of trading my car or selling to Carmax or something. I know it's worth more to a private buyer, but I don't have the time or energy to take pictures of it and find a buyer. I'd be willing to pay someone to find a buyer. Either a flat fee or a percentage of the sale. Does such a service exist? If it doesn't, I think i just stumbled on a million dollar business idea.