Little code to paste in the console to get the price of a list on amazon. (You need to open the list than execute the code)

amazonListPriceCalculator.js

var elementPrice = document.getElementsByClassName("a-size-base a-color-price a-text-bold");
var elementusedprice = document.getElementsByClassName("a-color-price itemUsedAndNewPrice");
var countedItems = 0;
var totalprice = 0.0;
for (var i = 0; i < elementPrice.length; i++){
    var price = parseFloat(elementPrice[i].innerText.replace(",",".").substring(4));
    if(isNaN(price)){
        price = parseFloat(elementusedprice[i].innerText.replace(",",".").substring(4));
    }
    if(!isNaN(price)){
        totalprice += price;
        countedItems++;
    }else{
	console.log(i)
	}
}

var textDiv = document.getElementById("list-header");
var newDiv = "<div>Total price: " + totalprice.toFixed(2) +" Counted elements: " + countedItems+"</div>" ;
var dp = new DOMParser();
textDiv.appendChild(dp.parseFromString(newDiv, "application/xml").documentElement);