It's not a microstepper drive but www.stepperworld.com has complete systems for hobby machines. Get the FET 3 board (not the cruiser special) and ask him about 100 oz'in steppers that are nema 23 size. They are not on his page but he sold me three. I think it cost me just over $200.00 for the whole setup, including the cable and current limiting resistors.
If you are willing to buy the steppers seperately, get the xylotex 3 axis board. www.xylotex.com and find some 100 oz steppers on ebay. No resistors required.
Eric