[gbm]

Spoiler:

Originally Posted by gbm

Try this change to the script.
Edit the following line in the script

      var pos0 = data.indexOf('class="priceLarge"');

change it to:

      var pos0 = data.indexOf('class="a-size-small a-color-price"');

This is the compete script with the change.

// @namespace   kakapo.public
// @description Checks price of Kindle ebook links in MobileRead forum posts. Translates amazon.com links into your local site, please install the correct version.
// @include     https://www.mobileread.com/forums/showthread.php*
// @version     3
// @grant       GM_xmlhttpRequest
// ==/UserScript==
var site_regex = /^(http|https):\/\/(www\.)?amazon\.(com)(\/.*)/;
var migrate_regex = false;
var migrate_replacement = '';
var currency_prefix = '$';
var ebook_url_regexs = [
  /^\/dp\//,
  /^\/[^\/]+\/dp\//,
  /^\/gp\/product\//,
  /^\/exec\/obidos\/ASIN\//
];
var check_price = function (elements, url) {
  var xhr = GM_xmlhttpRequest({
    method: 'GET',
    url: url,
    onload: function (response) {
      var data = response.responseText;
      var pos0 = data.indexOf('class="a-size-small a-color-price"');
      var pos1 = data.indexOf('>', pos0);
      var pos2 = data.indexOf('<', pos1);
      var price = data.substring(pos1 + 1, pos2).trim();
      if (price == '') {
        price = 'N/A';
      }
      var color = price == 'Free' || price == currency_prefix + '0.00' || price == currency_prefix + '0,00' || price == currency_prefix + '0' ? 'red' : 'blue';
      pos0 = data.indexOf('class="iou_cust"');
      if (pos0 >= 0) {
        price += ' already own';
      }
      for (var i = 0; i < elements.length; i++) {
        elements[i].insertAdjacentHTML('afterend', ' <span style="color:' + color + '">(' + price + ')</span>');
      }
    }
  });
}
var a = document.getElementsByTagName('a');
var to_check = {
};
for (var i = 0; i < a.length; i++) {
  var url = a[i].href;
  var parts = site_regex.exec(url);
  if (parts) {
    if (migrate_regex) {
      url = url.replace(migrate_regex, migrate_replacement);
      a[i].href = url;
    }
    for (var j = 0; j < ebook_url_regexs.length; j++) {
      if (ebook_url_regexs[j].test(parts[parts.length - 1])) {
        if (!to_check[url]) {
          to_check[url] = [
          ];
        }
        to_check[url].push(a[i]);
      }
    }
  }
}
for (var k in to_check) {
  check_price(to_check[k], k);
}

bernie

After further testing and coffee to get this script to work edit the following lines:

      var pos0 = data.indexOf('class="priceLarge"');

change to:

      var pos0 = data.indexOf('class="a-color-price a-size-medium a-align-top"');

edit following line

      pos0 = data.indexOf('class="iou_cust"');

change to:

 pos0 = data.indexOf('id="ebooksInstantOrderUpdate" class="a-size-medium"');

Here is the entire script with changes:

Spoiler:

// ==UserScript==
// @name        MobileRead Kindle Price Check (amazon.com)
// @namespace   kakapo.public
// @description Checks price of Kindle ebook links in MobileRead forum posts. Translates amazon.com links into your local site, please install the correct version.
// @include     https://www.mobileread.com/forums/showthread.php*
// @version     3
// @grant       GM_xmlhttpRequest
// ==/UserScript==
var site_regex = /^(http|https):\/\/(www\.)?amazon\.(com)(\/.*)/;
var migrate_regex = false;
var migrate_replacement = '';
var currency_prefix = '$';
var ebook_url_regexs = [
  /^\/dp\//,
  /^\/[^\/]+\/dp\//,
  /^\/gp\/product\//,
  /^\/exec\/obidos\/ASIN\//
];
var check_price = function (elements, url) {
  var xhr = GM_xmlhttpRequest({
    method: 'GET',
    url: url,
    onload: function (response) {
      var data = response.responseText;
      var pos0 = data.indexOf('class="a-color-price a-size-medium a-align-top"');
      var pos1 = data.indexOf('>', pos0);
      var pos2 = data.indexOf('<', pos1);
      var price = data.substring(pos1 + 1, pos2).trim();
      if (price == '') {
        price = 'N/A';
      }
      var color = price == 'Free' || price == currency_prefix + '0.00' || price == currency_prefix + '0,00' || price == currency_prefix + '0' ? 'red' : 'blue';
      pos0 = data.indexOf('id="ebooksInstantOrderUpdate" class="a-size-medium"');
      if (pos0 >= 0) {
        price += ' already own';
      }
      for (var i = 0; i < elements.length; i++) {
        elements[i].insertAdjacentHTML('afterend', ' <span style="color:' + color + '">(' + price + ')</span>');
      }
    }
  });
}
var a = document.getElementsByTagName('a');
var to_check = {
};
for (var i = 0; i < a.length; i++) {
  var url = a[i].href;
  var parts = site_regex.exec(url);
  if (parts) {
    if (migrate_regex) {
      url = url.replace(migrate_regex, migrate_replacement);
      a[i].href = url;
    }
    for (var j = 0; j < ebook_url_regexs.length; j++) {
      if (ebook_url_regexs[j].test(parts[parts.length - 1])) {
        if (!to_check[url]) {
          to_check[url] = [
          ];
        }
        to_check[url].push(a[i]);
      }
    }
  }
}
for (var k in to_check) {
  check_price(to_check[k], k);
}

This will check the kindle price and if already owned.

bernie