Total up the cost of all items in an Amazon wishlist

gistfile1.js

var list = $$("#item-page-wrapper .list-items table tbody .lineItemMainInfo .lineItemPart strong");
var total=0;
for(i=0; i<list.length;i++){
  total += parseFloat(list[i].innerText.replace("$",""));
}
alert(list.length+" items for a total of: $"+total.toFixed(2));

You can use the data-price attribute on the li. Tested on amazon com.

$$("li[data-price]").reduce((amount, li) => amount + parseFloat(li.getAttribute('data-price'), 0), 0.0)

This version takes into account elements without a price (such as items not available)

$$("li[data-price]").reduce((amount, li) => amount + Math.max(0, parseFloat(li.dataset['price'])), 0.0)

Latest Version:

$$('.a-price').map(_ => _.firstChild.innerText.replace('$', '')).map(_ => parseFloat(_)).reduce((a, v) => a + v)