'product',
'product_cat' => get_theme_mod('grocery_ecommerce_sale_product_category'),
'order' => 'ASC'
);
$loop = new WP_Query( $args );
while ( $loop->have_posts() ) : $loop->the_post(); global $product; ?>
post->ID )) echo get_the_post_thumbnail($loop->post->ID, 'shop_catalog'); else echo '
'; ?>