NEW YORK - "12 Years a Slave" is getting a post-Oscar bump - for the book it was based on. The 19th-century memoir by ex-slave Solomon Northup jumped from No. 326 on Amazon.com before Sunday night's Academy Awards ceremony to No. 19 on Monday afternoon. The film was directed by Steve McQueen and stars Chiwetel Ejiofor. It was among last year's most highly praised releases and won the Oscar for best picture.