If you know the origin zip code, destination zip code, weight, and approximate package size/shape, you can go right to the FedEx, USPS, and UPS web sites and get an estimate. You will quickly decide whether shipping them is a viable option for you based on the prices you see here.

If you really want to make it easy on the seller, your next step would be to start calling packing and shipping stores like "The UPS Store" or "Kinkos" and getting quotes for packaging, but I have a feeling that this is not a cheap service.