At first I found only the GSM / GPRS unlocked universal one from convergant technologies (
www.convergentech.com).
5 minutes ago I just found that GROWELL USA is offering an 1xRTT adapter for Sprint PCS Vision networks. This is most likely the one that I would be using.
So far no 1x EV-DO or 1x EV-DV cards but you wont find networks that support them yet anyways (verizon has 1x EV-DO in DC and San Diego for testing).
I hear that 1x EV-DO should be deployed near the years and by Verizon and that Sprint will deploy its faster 1x EV-DV networks early next year.
These all backward compatible with 1xRTT but 1xRTT is not forward compatible with them.