Force ssl on one page and force http on specific pages.

functions.php

add_action( 'template_redirect', 'pintop_ssl_redirect', 1 );
function pintop_ssl_redirect() {
        //page that should be ssl
        if ( is_page( 1264 ) && ! is_ssl() ) {

            if ( 0 === strpos($_SERVER['REQUEST_URI'], 'http') ) {
                wp_redirect(preg_replace('|^http://|', 'https://', $_SERVER['REQUEST_URI']), 301 );
                exit();
            } else {
                wp_redirect('https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'], 301 );
                exit();
            }
        } else if ( is_page( array( 'main', 'business-listing' ) ) && is_ssl() && !is_admin() ) {
            //pages that must be http
            if ( 0 === strpos($_SERVER['REQUEST_URI'], 'http') ) {
                wp_redirect(preg_replace('|^https://|', 'http://', $_SERVER['REQUEST_URI']), 301 );
                exit();
            } else {
                wp_redirect('http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'], 301 );
                exit();
            }
        }
}