I know, but at least it gives us a starting point. Surely the OP realized that when s/he used the website (if s/he did anyways) - it doesn't ever inquire about the condition.
But let's say the website says $1200. you know it will sell for say 800 - 1300, depending on the condition. Dented, scratched, etc, = 800, mint = 1300. Simple. It's all in the negotiations, anyways.