Cheap might not be the best approach, you get what you pay for in GPS.
I spend a good bit of time researching GPS last year or the year before and the prevailing opinion was to buy Garmin, not TomTom; still seems to be the case. I have a nuvi 760 and find it pretty good, used it in Croatia and it was surprisingly accurate (for the location). You'll still need maps alongside to be sure, but that's the case with all GPS'.
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