Speaking of the modern.ie site, there is a really great deal for a free 3-month trial for browserstack.com.
This may be only a short-term solution for you (that is only for those 3 months) unless you don't mind spending the $39/month fee.
Correction: if you only need IE, this applies to you (from the pricing page):
Only need desktop browsers? Buy a Lite plan for $19/mo. Buy a Lite plan for 1 user & test in 300+ desktop browsers.
The browser numbers are inflated though, I mean I don't see much of a point in testing your site in older versions of Chrome or Firefox (I guess for Firefox it might make sense in corporations).
I've been playing with the free trial for a while and it seems really awesome and very easy to use and if I was doing web development more professionally, it would be definitely worth investing into this tool. (Right now I'm more of a hobbyist with an occasional gig, so I'll probably look for other/free solutions soon.)