I bought it from Spot light tat time. For my wedding day. I think is $39.90/$49.90. 1 cylinder. Cant rmb liao.
spot light and party shops! they even sell it per balloon. i have since it at art box too. if I'm not wrong.
Spot light is selling at their plaza sing branch, it's 39.90 if I remember it correctly.
Party Stores!