Ask HN: Does anyone know how to find the right data plans for GSM/GRPS devices?

I am looking to make a tracking device with a monthly plan that is <$5 and possibly <$1 a month. What is basically needed is to send SMS text (few bytes of data) from this device every minute or so about the location. I think that the major wireless network providers such as AT&T, Verizon would be expensive if we just buy SIM and activate a data plan. I need to find re-sellers of data on either their network or other network. Amazon does it with somebody for their Kindle for even much larger data plan, but of course it is amazon, so the rules are different. It would be great if somebody could help me with this, or just point me in the right direction. If you live in the bay area, I will also buy a pint! Additionally, my fiance' says I am a great guy to hang out with ;)