I went to KUL > SIN > KUL Last month following is how I planned everything by my self.
Air Tickets Special Offer by Malindo Air (Better than SriLankan must say) CMB > KUL > CMB at 20,100/- (With 30KG and Meals)
KUL to SIN > Air Asia at 4500/- (With just 7kg, have to pay for checkin luggage)...