Offroad-Express

Anyone know where I can get updated free/opensource maps for my Uniden GPS?
I know it's not the best out there, but it works and I don't owe any money on it.
I've tried some sites, but they all seem to support Garmin.

I run a Uniden GPS and they are good for the price, the only problem being, you have to buy the map upgrades on CD.
You may pick up cheap updates on Trade Me, as those who get free updates when they purchase them often copy them to a number of SD cards and sell them off.