Just go to college road, Adjacent to Lahori samosa house there are a few electronics parts shops like IC Master, Madni Electronics.
Then on the opposite side Faheem electronics, "New Allied Electronics", New Dynamic Electronics and others, these are all reasonable people, even if they don't have the parts they will guide you to the most appropriate shop.
For online purchases I would refrain from such, and order anything not available in local market from Roseace, who are the main distributors of RS Components, located at "14-Y,Shahnaz Plaza, Johar Road,F-8 Markaz, Phone 051-2261841-2,
www.rspakistan.com" most reliable but the lead time is about 6 weeks.
Some tips, if you haven't done soldering particularly on SMD type boards, don't know how to trace the tracks, and don't have the necessary equipment at-least a digital multimeter, etc please refrain, as soldering on such board requires expertise,and high quality soldering iron/station (no more than 20 watts) and high quality precision tip which is seldom available from the local market, along high quality soldering wire. 360 controller boards are very thin, less than standard, any extra pressure will break the board