AssetStoreBuddy.js

// ==UserScript==
// @name        AssetStoreBuddy
// @namespace   unitycoder.com
// @include     https://www.assetstore.unity3d.com/en/#!/search/*
// @version     1
// @grant       none
// ==/UserScript==

// currently need to press F5 to run these

$(window).load(function(){
	// TODO: use other methods to findout page finished
	setTimeout(InitAssetStoreBuddy, 5000);
 });

function InitAssetStoreBuddy()
{
	// take previous search value
	document.getElementById("searchInput").value = location.href.substring(location.href.lastIndexOf("/")+1,999);

	// TODO: create sort by price button
	SortByPrice();

}

function SortByPrice()
{
	var div = document.querySelector('#packageList');
	var divs = div.querySelectorAll('.littleblock');
	var titleDiv = document.querySelector('#cattitle');
	var nodesArray = [].slice.call(divs);
	nodesArray.sort(function (a, b) {
	   var price1 = a.getElementsByClassName('price')[0].innerHTML.replace(/\D/g,'');
	   var price2 = b.getElementsByClassName('price')[0].innerHTML.replace(/\D/g,'');
	    return +price1 - +price2;
	});
	$('#packageList').empty().append(nodesArray);
}