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I've read on other post of discounted GPS receivers from radioshack in the US for $30 - maybe the easiest way could be to keep searching the net for any offers on GPS receivers, even if it takes a few months to find something cheap it might be quicker than sourcing all the components for a decent price - my bet is that even if you can buy the actual parts, it will only be cheaper than buying a pre-built unit unless you're buying large quantities of components
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