Applicability of the New Rules. The new cargo securement rules apply to the same types of vehicles and cargo as the old rules, covering all cargo-carrying commercial motor vehicles (as defined in 49 CFR 390.5) operated in interstate commerce.
Most commercially-produced postcards measure approximately 4.21 inches by 5.47 inches. Less commonly, smaller postcards are typically 3.5 inches by 5.5 inches, close to the minimum size the USPS allows.
For postage of a 1st class, 1 oz. envelope the cost is $0.49. For postcards the rate is $0.34. Click here to see more postage rates. For Save-the-Dates you can expect an average cost of $150 for 100 postcard STDâs.