Hi Matt,
Jaycar used to sell a stepper controller kit. I think it is discontinued. I used it in one of my portable solar eclipse mount motor controls. It's only for unipolar stepper motors.
There are many off the shelf printed circuit boards available on ebay that have everything you need. These are made in China and cost $1-$5 each. You only need a few of these -
Regulated POWER SUPPLY
http://www.ebay.com/itm/DC-DC-Buck-S...item257c163994
PULSE GENERATOR sets the base clock speed for the motor
http://www.ebay.com/itm/NE555-adjust...item484f23941c
STEPPER DRIVER
http://www.schmalzhaus.com/EasyDriver/
This one allows microstepping, forward reverse, full,1/2, 1/4, 1/8 times microstepping selectable and should drive your motor without an intermediate driver. The driver cards fully populated with components can be purchased very reasonably from sparkfun who support the designer to produce more of this stuff. You can also buy ripoff versions of this board on ebay for a few dollars.
This boards takes a simple pulse generator input or can be controlled from a computer via usb. It is handy to be able to run a drive without having to have a computer attached.
cheers
Joe