Why is there a surcharge for residential delivery of a Colossal Gram?

Both UPS and FedEx charge an additional amount for residential delivery. When you enter the destination address you are asked to choose whether the address is a residential or commercial address. If you mistakenly choose the wrong designation and the carrier later charges us for a residential delivery, we reserve the right to charge that cost back to you. (FYI, each carrier considers a business within a home as a residential address and subject to the residential delivery surcharge.)