First of all, I wish you a happy wedding.

If the quantity is small, any wedding company in Shenyang can buy the helium balloon you want.

If the quantity is large, I suggest you buy a helium tank to inflate it yourself. If you don't know where to buy a helium tank, I can help you check the manufacturer. This will be a lot more cost-effective.

I hope I can help you!

This answer comes from the official answer of China Balloon Association. If it helps you, please adopt it. In order to help more Baidu netizens! thank you