Downloadable papercraft minis are also a good, and generally cheap option. Made in Paper and OneMonk.com are a good place to start with figures; Toposolitario.com and Finger and Toe for vehicles and card terrain.
One Page is what got me into wargaming in the first place. But I had no miniatures. So I applied the following methods to make entire cardstock armies. If you don't have Photoshop, you can download Photoshop CS2 for free from Adobe (basically abandonware).
Are there any lines that look particularly good alongside Age of Sigmar minis? I was thinking about getting some Gripping Beast SAGA minis to use alongside them to play Age of Fantasy and flesh out the ranks with cheaper alternatives.
I have quite a few Games Workshop models but don't want to be reliant on them.
Like Wyloch, I'm going the cardstock route, but I'm actually designing my own. I was initially going to build 2.5d Tyranids, and made a start, but then decided to scrap the copying and properly design my own.
So here's my first basic Hive Grunt with bio-gun. This one's just a tester while I refine the colouring techniques, but there's more to come, starting with Assault Grunts and Warriors, and hopefully some new Battle Brothers, too.