go to those party shop... they do have rented hellum...
4yrs ago i went to this party shop at Robinson somerset.. there is this novelty shop beside the teochew resturant ..they do rent the hellum gas.. =)
$1.50 for a helium balloon is not expensive, who suggests to use as props than who pay for it.
or else you just tell your couple you can only afford balloons that can't fly but can roll on the ground.
Have helped a fren collect these balloons before and the quality of the ones they provide is much better (in terms of thickness and size) A fren requested they fill up a couple of her own balloons and those weren't too good and burst a couple along the way to the party.