I'm going to try my best to ignore all snake-hate comments, as they're by far my favorite pets to have. Although, everyone has a right their own opinion; I, for one, hate birds...except when they're fried.
Back to the topic, I do have to agree that the snake doesn't appear to be taken care of in the most ideal way, but its obviously no fault of the the person trying to sell it. My initial recommendation is to give it to a local animal shelter that is equipped to handle herps. If its a female and in fairly decent condition, you might get lucky and find a breeder who would pay top dollar, possibly over $100. But aside from that, I agree with Walls; you probably won't get more than 30-40 bucks off it. If time is more of a factor than getting some extra cash. then I would just give it to anyone who will take care of it and get started setting up that 55 for your own agenda.