Bud, check out a service like ishipper.com. I never have to worry about changing my rates, because ishipper feeds my website with all the shipping rates, and they always have the latest updates. My website sends them a query which has the zip code and total weight, and they send back the rates for the services I want to offer my customers. You can even have it add on 5-10% extra or say an even $1.50 per package to cover any additional handling fees you might have on your side. It's surprisingly accurate for UPS ground and USPS Priority, and usually pretty good for 2nd day, 3rd day and overnight rates. Check it out, it saves me a ton of headaches.