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.