Thanks so much. I didn't know there were regional rates. I have been shipping stuff to my daughter, also in California, using the higher fixed-rate priority boxes.The USPS website-it is free to use, and also gives you a discount on shipping. Order free boxes from there too. The Regional rate box A is the perfect size to ship many things and is good for up to 15 pounds. I can ship to anywhere in the East, and West to probably CO for around $6 by using this box and printing postage online. Regional rate boxes are only available online though!