If you're not interested in making games you can simply enter your email address and get 2 free games and a demo.
This bundle has been crazy popular and as such is already well over a million dollars raised for charity. This particular bundle supports Doctors without Borders so not only do you get some awesome stuff but it goes to a great cause.
https://www.humblebundle.com/gamemaker-bundle

You'd think GameMaker would just make little simplistic games, but it's amazing what you can do with it. Getting started in it is simple, I've made a few not-really-games just playing around with it, and it's very easy to get into but has enough depth to make some impressive stuff. It's not going to be as complex or push the graphical boundaries as what you could do in Unreal Engine or something, but there have been some indie darlings that have used GameMaker.
I picked this up! I even spent a little more than the max needed to unlock everything since it is such a great value.
I picked this up, too. Just the base package without any modules, though I'm tempted to go in for the HTML module. I'm assuming they are about to release a new version of GameMaker, but this is an amazing deal regardless. One of my favorite games in recent history (Risk of Rain) was made on GameMaker!
Worth noting that this is the Pro version of GameMaker Studio, so it comes with features that the free version doesn't.