If you can list the details I can give you a better idea. Do you already have it? The Burner 2.0 is going for up to $75. I'm also guessing it is a steel shaft? The things you will want to know if listing it:
The model (Burner, Burner 2.0, etc)
Right or Left handed golfer
Shaft construction: Steel or Graphite
Shaft "type": Regular, Stiff, X-Stiff (there will be a sticker on the shaft that states this)
Selling individual irons are harder than selling "woods". With that many flooding the market, I would try to sell it locally like on craigslist. If it were me and I didn't want it, I would want to move it fast and probably list if for $40. That's just what I would do. You could start higher and always move lower.