ZigBee USB Interface

I looked at this a few months ago and decided it was a ridiculous price. But they are targeting developers who are using their chipset, so they are dipping into corporate pockets. The wed page says that software is available upon request, but they don't say whether that is the ZigBee stack, and whether it costs extra.

I got my USB/ZigBee interface with the FreeScale developers kit, but it had no ZigBee stack software, only IEEE 802.15.4 software. A ZigBee stack for the PC seems to be elusive still.