Ahoy!! Thanks for the info guys. Hopefully, it will help many buyers seeking discounts on Dell.
Adding to it, if someone is looking for students-discount on Macbook-Pro. It is 5% on college-student id.
Also, one of my friend customized the rig online and then talked on phone to Dell's customer officials about discounts. They asked him to mail whatever rig he is looking for then they can decide the discount if he can get any discount on it on any terms.
Never asked if he got any, but seems like huge chunk can be snatched from them