EBAY. How can i figure out shipping without having to go down to the post office?

www.usps.com will help you figure the shipping. It all depends on weight and size of package. USPS also have two sizes of flat pack boxes which have a fixed postal rate and can take up to 10 pounds weight, and these work well as free packaging. You would have to go to the post office to buy them. You could also ask about the mailman collecting from you any packages ready to ship, when he is delivering your mail.