get most expensive item on http://www.theodoregray.com/PeriodicTable/Elements/006/index.html

mostexpensive.js

var pricelist = [];

for (var i=0; i < bs.length; i++) {
    if(bs[i].childNodes[0].nodeValue === "Price:") {
		if (bs[i].nextSibling.nodeValue.charAt(1) === "$") {
			pricelist.push(parseInt(bs[i].nextSibling.nodeValue.substr(2)));
        }
    }
}

console.log(Math.max(...pricelist));