ft-stock-checker.userscript.js

// ==UserScript==
// @name         FastTech Stock Checker
// @namespace    http://phreak.space/
// @version      0.0.2
// @description  Show the stock info on the FastTech search page.
// @author       ayan4m1 <andrew@bulletlogic.com>
// @match        https://www.fasttech.com/search*
// @match        https://www.fasttech.com/category/*
// @require      https://code.jquery.com/jquery-3.3.1.min.js
// @require      https://gist.githubusercontent.com/BrockA/2625891/raw/9c97aa67ff9c5d56be34a55ad6c18a314e5eb548/waitForKeyElements.js
// @grant        none
// ==/UserScript==

$.noConflict();

(function() {
    'use strict';
    waitForKeyElements('#Products_Grid', (node) => {
      jQuery('#Products_Grid').find('.ProductGridItem').each((i, v) => {
        const elem = jQuery(v);
        if (elem.find('.GridItemSoldOut').length > 0 ||
            elem.find('.GridItemEOL').length > 0) {
          elem.remove();
        } else {
          setTimeout(() => {
            const url = elem.find('.GridItemName a').attr('href');
            jQuery.ajax({ url }).done(result => {
              const status = jQuery('<div />').html(result).find('meta[itemprop="availability"]').next().text().trim();

              if (status !== 'In stock') {
                elem.remove();
              } else {
                elem.find('.GridItemName').after(`<div style="line-height:20px;color:green;">${status}</p>`);
                elem.find('.GridItemPrimaryCategory').remove();
              }
            });
          }, 750 * i);
        }
      });
    });
})();