calc

(($) => {
  const prices = Array.from($('.suggested-price'));
  const items = [];

  prices.forEach(node => {
   const name = $(node).parents('.item-add-wear').parent().find('.market-name.market-link')[0].innerHTML;
   const price = parseFloat($(node).parents('.item-add-wear').find('.item-amount')[0].innerHTML.replace('$', '').replace(',', ''));
   const suggest = parseFloat(node.innerHTML.replace('$', '').replace(',', ''));
   const profit = suggest - price;
   const amount = 100 * (profit / price);

   items.push({
     name,
     price,
     profit,
     amount,
   });
  });

  items.sort((a, b) => b.amount - a.amount);

  console.log(items.filter(i => i.price < 500));
})(jQuery);