Please help! Gender reveal services?

Shelagh

My son is turning 1 in June. I want to find out the gender by using a box with balloons in it. I was wondering if there is a company or a service that anyone knows of that the doctor can mail to that will fill the box for us? Or if we can bring the ultrasound to a party store that wouldn’t mind filling it for us? I don’t want any family or friends doing it because I want everyone to find out together that matters to us. Thanks in advance!