£190 + VAT each from Zapp. That comes with the software licence as well so if you factor in what should/would have been paid for a Mach licence it's not too bad.

The software is quite nice and it's still under further development with new features that look quite promising.
I like the idea that it's shifted on from the whole parallel port requirement and there's a load of inputs/outputs that can be used with the board. One of the other benefits of course is with the SD card addon it can be a stand alone machine. Great for production run kind of stuff or computer in the house, machine in the garage/shed etc.