http://www.banggood.com/TB6600-Upgraded-Version-32-Segments-4A-42V-5786-Stepper-Motor-Driver-p-981997.html?p=CS03105712041201608F I've recently heard good things about these drivers.

General CNC CNC Routers
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I’ve recently heard good things about these drivers. USA Free shipping 10 bucks each O_O I will be ordering some of these for my next machine.

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They aren’t horrible… but they can be a little… finicky. e.g. running rough and needing a lot of tuning. They are certainly better than the TB6560’s. And… that assumes that you are getting a /real/ 6600, or at least a competent knock off… I’ve been burned before, so buyer beware.

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I just did a blog post on cheap (not in a nice way) Chinese Electronics. The videos I link to are worth watching.

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@HobbyCNC Great points about the caps!