GreaseMonkey script to see the BTC price before checkout.

NewEggBTC.user.js

// ==UserScript==
// @name        NewEgg Price in Bitcoin
// @namespace   gist.github.com/vsviridov/
// @description Display the grand total of your shopping cart in BTC
// @include     *//secure.newegg.ca/Shopping/ShoppingCart.aspx*
// @include     *//secure.newegg.com/Shopping/ShoppingCart.aspx*
// @version     1
// @grant       none
// ==/UserScript==

var targetCurrency = "USD";

switch(location.host.split('.').pop())
{
    case "com":
        break;
    case "ca":
        targetCurrency = "CAD";
        break;
    default:
        console.error("Cannot determine currency from the domain");
        return;
}

var widget = jQuery('.gm-btc-price-widget .btc-price');

if(widget.length === 0)
{
    widget = jQuery('<tr class=".gm-btc-price-widget"><td class="discount-code"><h3>BTC Widget</h3>Price in BTC: <span class="btc-price"></span></td></tr>')
        .insertAfter('.foot tbody tr:nth-child(3)')
        .find('.btc-price');
}

var total = parseFloat(utag_data.cart_grand_total);

function updateRate()
{
    jQuery.get("https://bitpay.com/api/rates", { json: true })
        .then(function(rates)
        {
            var rate = rates.filter(function(rate) { return rate.code === targetCurrency; }).pop().rate;
            var price = (total / rate).toFixed(8);
            widget.text(price);
        });
}

updateRate();
setInterval(updateRate, 65 * 1000);