[Gargoyle_Steve (Steve)]

Are you after just the street level Satellite-Navigation maps themselves, or do you mean you need a complete system of map data software with street level navigation plus a software application to read / guide you from those maps?

I suspect that "Affordable" may not enter into it either way but can you give us an idea of your intended budget for such things? I used to sell Sat-nav systems amongst other things in a former life (err, job) and many of the sat-nav systems here (generally the better ones anyway) use the "Whereis" street database info. Map data alone can be $400-700 in Aussie dollars - that IS nationwide though.

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What about hiring a portable sat nav unit while here instead?? I can't tell you (yet) who may hire these out but it may be worth a try. If you have options then I recommend either the Navman ICN 500 or 700 series models, or the Garmin StreetPilot units. Hiring could end up much cheaper.

If you are also hiring a car then certain vehicles have sat nav built in, or an option may exist to add or include the hire of sat nav possibly at additional cost. There's other companies apart from the 4 listed below that rent cars with sat nav built in:

AUSTRALIA
Thrifty Australia have a supply of Holden Commodore 4.0L (or similar) sedans with GPS Satellite Navigation at certain locations. These would be on request and the GPS unit is built into the vehicle.
The cost is included in the daily Rate from AUD$76

Hertz Australia have a supply of Premium Vehicles with GPS Satellite Navigation at certain locations. These would be on request and the GPS unit is built into the vehicle.
The cost is included in the daily Rate from AUD$76

Europcar Australia have a supply of Ford Fairlane Ghia 4.0L (or similar)sedans with GPS Satellite Navigation at certain locations. These would be on request and the GPS unit is built into the vehicle.
The cost is included in the daily Rate from AUD$79

Red Spot Australia have hand held units for rent in certain locations.