Low cost 6A stepper drivers on eBay

There are two vendors selling basic 6A stepper drivers on eBay.

One has a website http://www.electronicutopia.com and is selling
them for under $25. Seems to be a basic full step driver with no
isolation or heatsink.

The other is user "esreng". His boards are about $47 but do half step
and have a heatsink.

I am looking for drivers to drive ~200oz/in steppers for my Shoptask
3-in-1. The Shoptask has a 2:1 ratio on the stepper drive and a 10
tpi lead screw so one full step would be 0.00025", which is more than
the accuracy of my Acme lead screws, I think, so I don't think I need
half step or microstep drivers.

If anyone has any experience with these drivers or vendors or any
other advice on these it would be most welcome. I am on a small
budget so these are very tempting.

thanks

Alastair