Spent.user.js

// ==UserScript==
// @name         Spent on Ali ( with PLN support)
// @namespace    http://tampermonkey.net/
// @version      0.2.1
// @description  Get full amount of money spent on products in USD and PLN
// @author       Peter Willemsen <peter@codebuffet.co>
// @author       Michał Gątkowski <gatkowski.michal@gmail.com>
// @match        https://trade.aliexpress.com/orderList.htm*
// @match        https://trade.aliexpress.com/order_list.htm*
// @grant        GM_setValue
// @grant        GM_getValue
// @require https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js
// ==/UserScript==

var kfullPriceUSD = "full_price_USD"
var kfullPricePLN = "full_price_PLN"
var kStarted = "started"
this.$ = this.jQuery = jQuery.noConflict(true);
$(function() {
  var $btn = $("<input type='button' style='left: 10px;' class='ui-button ui-button-primary search-btn' value='Check full spend amount'/>");
  var $btn_disable = $("<input type='button' style='left: 10px;' class='ui-button ui-button-primary search-btn' value='Disable'/>");
  $btn.click(function() {
    GM_setValue(kfullPriceUSD, 0);
    GM_setValue(kfullPricePLN, 0);
    GM_setValue(kStarted, true);
    window.location.reload();
  });
  $btn_disable.click(function() {
    GM_setValue(kStarted, false);
  });
  if (!GM_getValue(kStarted, false)) { // if disabled
    $('#simple-search').append($btn);
  } else { // if enabled
    $('#simple-search').append($btn_disable);
  }
});

(function() {
  if (!GM_getValue(kStarted, false)) { // if disabled
    return;
  }
  var floatify = function(text) {
    return parseFloat(text.replace(",", ".").replace(/[^\d.-]/g, ''));
  };
  var countOrdersTick = function() {
    var currentPricePLN = 0;
    var currentPriceUSD = 0;
    $("p.amount-num").each(function() {
      if (/[$]\s\d+[.]\d\d/.test($(this).text())) { // USD
        currentPriceUSD += floatify($(this).text());
      } else if (/\d+[,]\d\d\sPLN/.test($(this).text())) { // PLN
        currentPricePLN += floatify($(this).text());
      }
    });
    console.log("current page price in USD: " + currentPriceUSD);
    console.log("current page price in PLN: " + currentPricePLN);
    var fullPriceUSD = GM_getValue(kfullPriceUSD, 0);
    var fullPricePLN = GM_getValue(kfullPricePLN, 0);
    GM_setValue(kfullPriceUSD, fullPriceUSD + currentPriceUSD);
    GM_setValue(kfullPricePLN, fullPricePLN + currentPricePLN);
    console.log("current full price in USD: " + (fullPriceUSD + currentPriceUSD));
    console.log("current full price in PLN: " + (fullPricePLN + currentPricePLN));
    var $nextBtn = $("a.ui-pagination-next.ui-goto-page:first");
    if ($nextBtn.length === 0) {
      alert('Your total amount spent in USD on AliExpress: ' + (fullPriceUSD + currentPriceUSD).toFixed(2) +
        '\nYour total amount spent in PLN on AliExpress: ' + (fullPricePLN + currentPricePLN).toFixed(2));
      GM_setValue(kStarted, false);
    } else {
      $nextBtn.get(0).click();
    }
  }
  setTimeout(countOrdersTick, 1000);
})();