Why values dont shows in custom post column?

add_action( 'manage_post_custom_column', 'price_column_display', 10, 2 );

This line is wrong. I think it should be:

add_action( 'manage_catalog_post_custom_column', 'price_column_display', 10, 2 );

The hook format is as follows:

manage_{$post_type}_posts_custom_column

EDIT:

try your custom column code like the following code. I know in this format it works:

add_action('manage_stores_posts_custom_column', 'sc_stores_manage_columns', 10, 2);
function sc_stores_manage_columns($column_name, $id) {
    $custom = get_post_custom($id);
    switch ($column_name) {
        case 'town':
            echo $custom["sc_stores_town"][0];
        break;

        case 'road':
            echo $custom["sc_stores_road"][0];
        break;
    }
}