With our pickup/packaging business there is no way to give a price up front. Only to give an estimate based on the information we receive. There are too many variables that go into the packaging process (padding, re-arranging items, multiple boxes etc). Something that I would love to be perfect on but its a very hard problem.
We typically split items into multiple boxes for safety or to reduce the cost of the overall shipments. There are some very high oversize fees from the carriers that we try to avoid as much as possible.
I hope you will give this new product a try :)