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I would think there were cheaper options with less sensitivity using something you could order at sparkfun[1].

[1] http://www.sparkfun.com/commerce/categories.php?c=4

mhm, but those are GPS receivers only. SFE sells the 'ubertracker' for $325 which is GPS + GSM. You could also whack together a super-cheap prepaid phone ala http://instamapper.com

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