Anyone know where I can buy a cheap bluetooth GPS unit in New Zealand?

I see Amazon have things like these, but here I haven't found much in that range.

http://www.amazon.com/Holux-M-1000-Channel-Bluetooth-Receiver/dp/B000QJFOTM/ref=sr_1_1?ie=UTF8&s=electronics&qid=1244803755&sr=8-1
http://www.amazon.com/Globalsat-BT-359-GPS-receiver-module/dp/B000GWGHOK/ref=pd_sxp_grid_i_0_1

I just want to use the maps better on my phone, as it doesn't have a built in unit.