gobiz, if ur not gonna go into serious racing that requires FIA-approved helmets etc, u can just buy motorcycle helmets. Open face for comfort, full face for the extra "seriousness". just go to the nearest bike shop nearby ur house. cheapest bike shops are in sentul. if sentul is near ur place then it might be worth it to go there. bought my arai immitation full face bike helmet there for rm150 in 2002. still using it today.
pricing maybe about rm150-300 for full face + balaclava for normal brand bike helmets. price will go upwards if u want FIA/snell approved helmets or the stig's helmet hehehe.
helmet advice based on personal experience:
1. NEVER ever lend ur helmet to anyone. if ur gonna drive in track regularly, buy a cheapo rm30 helmet for people to borrow/wear when they ride as ur passenger. my helmet has got some missing clips n inside paddings cos i lent my helmet to someone else. when i got it back its farking smelly n got some things missing.
2. wear a balaclava to avoid smelly helmet. u can put the balaclava in the washing machine but not the helmet...