Find out the price of a used laptop, as if you are interested to buy one, especially with specifications matching your laptop's
Step3
Of the shops telling the highest price, ask how much can they pay if you wanna sell one
Step4
using your negotiation skills, agree on the maximum they can offer. the sales rep would normally say that it depends on the condition.try to take an idea in that case for a one with an average condition.
Step5
now bring your laptop and complete the deal
Tips & Warnings
try to give accessory of the laptop you have and do not find them useful without that particular laptop (e.g. docking station, etc.). This will add value to the laptop.