Please check your balloon quantities and sizes carefully as our gas supplier does not credit for any unused gas.These are estimates only  provided by our supplier based on standard latex balloons. 3-5 business day advance notice needed. For last minute needs we will try our best to meet your needs. Payment is required at time order is placed and are  non-refundable once ordered. Again, please check your balloon quantities and sizes carefully as our gas supplier does not credit for any unused gas.