diff --git a/alternate-price-per-tera.js b/alternate-price-per-tera.js
new file mode 100644
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+++ b/alternate-price-per-tera.js
@@ -0,0 +1,29 @@
+// ==UserScript==
+// @name Alternate HDD Price per TB
+// @namespace http://tampermonkey.net/
+// @version 0.1
+// @description Alternate HDD Price per TB
+// @author sergio.am
+// @match https://www.alternate.es/Discos-duros*
+// @icon https://www.google.com/s2/favicons?sz=64&domain=alternate.es
+// @grant none
+// ==/UserScript==
+
+(function() {
+ 'use strict';
+
+ const re = /\w+\s/g;
+
+ $('head').append("");
+
+ $('.grid-container.listing a.card').each(function (idx, item) {
+ var price = parseFloat($(item).find('span.price').text().replace('€', ''));
+ var name = $(item).find('div.product-name').text();
+ var cap = $(item).find('ul.product-info li:first-of-type').text();
+ var tb = parseInt(cap.match(/Capacidad: (\d+) TB/)[1]);
+
+ var pricePerTb = price / tb;
+
+ $(item).find('span.price').append('' + pricePerTb.toFixed(1) + ' €/TB');
+ });
+})();
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