Shipping wheels

Some in norcal wants to buy my wheels and I'm in socal, therefore i gotta ship it. What is the cheapest way to ship it? I was thinking of getting cardboard and cutting a circle just enough to cover the front and back of the rim. Then Im gonna use those shipping fat clear tape to wrap it up. How much would it cost to ship it this way? Please help if you have experience in this. Gracias, xie xie and thank you!