2) Mini-USB Lightning Harness Adapter ($39.99 w/ shipping)
3) Motorola i290 ($49.99 before tax and/or shipping)
4) Instamapper.com + Tracking Application (free)
Boost Mobile's $.35/day unlimited data plan (via the "wireless web" activation option) is unnecessary. One only needs to add $10 (the minimum) to the phone's balance every 90 days, to keep it activated. The balance never gets used (unless you use the phone for calls), it just expires after 90 days.
Other Boost Mobile phones, such as the i335 or i425, should work fine. Check the Instamapper.com discussion forums to read about others' experiences. I've only tried the i425, but it's no longer available. The i290 is currently the cheapest available option. For iDEN phones without a mini-USB port, one may need to replace the "Lightning Harness Adapter" above with the Falcon Wiring Harness. This might be even cheaper, but may require a bit more work to install. (FYI, the adapter is what turns on the phone when the car is started).
I've been using a similar setup for about 8 months, it's awesome!
