CDMA or WiMax ?
If Sprint has commissioned HTC to produce a Wimax version of a handset, it is quite understandable that there would be restricted runs for this as this is for a limited market. If Sprint ordered 300k units, HTC would produce 300k units and then return to producing the real HTC phones.
That is the main problem with those proprietary technologies that are not in widespread use. It will get harder and harder to get the cool phones in any quantity at an affordable price.