VERIFIED SOLUTION i
The information provide by the USPS rate tables for commercial mailers the .470 rate isn't available because of discounts that are applied and given to commercial mailers. The .470 rate is available for First Class letters if mailing as a retailer [meaning placing a personal 47 cent stamp on the letter]. The ONLY way a commercial mailer can receive the .470 rate is to have a [standard 3rd class mailing] with weight not over  one ounce. Please see the USPS Pricing Chart url: https://pe.usps.com/text/dmm300/notice123.htm for more pricing information.
UPDATED: October 4, 2017