Showing latest post without 301 redirect

by

Custom query loops and custom page templates are your friends.

Ditch the redirect function and on your home page template do something like this:

<?php
$args = array(
    'post_status' => 'publish',
    'post_type' => 'seller',
    'posts_per_page' => 1
);

query_posts( $args );

// the Loop
while (have_posts()) : the_post();
    the_content(  );
endwhile;
?>

You can find all args here