Yea that is a shame, the drivers from routoutcnc.com would sound like a good choice for that machine. Price £30 + £4.25 P&P to the UK Only EACH. If you goto his ebay shop i think they are a little cheaper, let me know ill send you the link if need be.

Features:
2.5 A 30V Output Drive Capabilities.
3V to 5V logic inputs.
Synchronous Rectification for low power / heat dissipation
Internal UVLO and Thermal shutdown circuitry.
Small PCB foot print only 66mm x 77mm
Internal 5V logic driver onboard (no need for 5v Supply)
Enable – Turns the motor off when not being driven.

For a complete PDF Spec sheet Click on the link below. You will need Adobe Reader to read it.
http://www.routoutcnc.com/RoutOutCNCStepper.pdf
How many of these machines have you got ?