WASHINGTON, Oct. 31 /U.S. Newswire/ -- Trippi Multimedia has joined WakeUpWalMart.com in launching a national advertising and multimedia campaign about "the movie and the memo Wal-Mart does not want you to see." Trippi Multimedia has produced a 30 second TV ad, titled "High Cost," to be shown in numerous cities beginning Monday, Oct. 31. It is a preview of the Robert Greenwald documentary "Wal-Mart: The High Cost of Low Price." The ad will air in New York City, the Washington, D.C. metro area, Los Angeles and Little Rock, Ark. The text of the ad is as follows: Announcer: The movie...