— Package it for shipping, weigh it and the post office web site can give you a cost. —In the US, Priority Mail flat rate boxes can be a very good bargain, the price is the same even when shipping to Hawaii or Alaska. —The USPS will send you the boxes for free, you can order online —Free shipping can be a good selling point, you might get more bids and actually make more money. But still package and weight before you try to figure out if that might work.