WASHINGTON, D.C.: Starting next spring, the U.S. Postal Service wants to charge you 33 cents to mail a letter. To sell the increase, which is roughly in line with the penny-a-year increases the USPS has long demanded, the service's website published a shopping list showing how prices for food items such as ice cream, salad, and yes, pork ribs, have outstripped recent stamp price increases. Come on, you can't buy a pork roast on the Web. But you can send a letter, and for a lot less than 33 cents.