One gumstix+bluetooth (200mhz) $184 link
One bluetooth GPS device $196 link
One bluetooth/gprs cellphone $already_have
The gumstix has a serial-over-bluetooth connection to the GPS and the cellphone. The gumstix reads from one and writes to the other. easy. in fact its so easy the phone should be able to do that on its own. So all i really need is the bluetooth GPS device.