Not surprisingly, Richard Pryor's new "Live on the Sunset Strip" is, excuse the expression, a hot property at the nearly 1,300 theaters where it's currently playing. It's been a couple of years since anyone has had the chance to see Pryor in a concert setting, and his first two such films were both hits. "Richard Pryor Live in Concert," in fact, is still playing at midnight shows across the country--some of them at the same theaters that are now showing his new film during more hospitable hours. In its first weekend, Pryor's film was the country's biggest grosser; after two weekends--10 days total--it had already earned more than $17 million. (In contrast, "One From the Heart" had yet to rack up a single million after more than 5 1/2 weeks on the screens.) And Pryor's film cost considerably less than just about anybody else's. The Rastar Films/Columbia Pictures release cost only $4.2 million to complete, $3 million of which went directly to its star. With salaries like that, Pryor should be able to live in style in Hawaii for a while longer--if he ever finds time to return home, that is. After the concert movie and his starring role in "Some Kind of Hero," Pryor has a full slate: a remake of the German film "The Toy" with Jackie Gleason (for this one, the studio is holding a contest to find a child who resembles a young Gleason, whatever that looks like); a role in "Superman III" as somebody who "starts off as a villain, but ends as a hero," according to Warner Bros. production president Robert Shapiro; a World War II comedy titled "Ain't No Heros," costarring Richard Dreyfuss (Pryor and Dreyfuss end up caught behind enemy lines in Africa); and biographies of Charlie Parker and Malcolm X, the latter to be directed by "Prince of the City" director Sidney Lumet and based on Alex Haley's biography.