Going rate for used factory flares?

Trying to figure a fair price for a guy who wants my factory flares.
2012 dark gray flares in great shape.
What's a fair asking price for the set?

Fronts are sometimes given away or found on the cheap. Folks going to 37's sell them or the fenders w/flares pretty common thus not much value. Seen them around $50 each, I know that is what I paid. The rears aren't seen as much and should be able to get more, maybe $100-150 which would be close to half price of what you can find online.