I was offered $100 less than my online quote because SellBroke.com said that all 3(!) of my computers that I mailed in had "bad batteries", even though they all functioned perfectly well and had excellent battery charge holds. I followed up with the company and they said that the number of battery cycles for all 3 machines was too high (439 cycles, 1039 cycles and 1500 cycles).
All older used laptops will have a high number of charging cycles and it is assumed that sellbroke.com would have already factored that price reduction into the quoted price, based on the age of the computer.
In future, I recommend that SellBroke.com tell people on their website that their batteries must have under X # of charging cycles to get full price, or should amend their quote generator to factor in that information. Not disclosing this information on the website, in the FAQ, or on the quote generator is suspicious and can give customers the idea that the business is fraudulent.