First you order the device. Pick your spot. Do your shopping. If you find it for less than $123.08, buy it there. If, after you search, $123 sounds as good as any place, and if you don’t have a preference, get it from Amazon and they’ll pitch in something like $2 for Brigada:
http://www.amazon.com/exec/obidos/ASIN/B000YTZV74/teamexpansiononl
If you find it cheaper, just click “comment” below this item on the web and you’ll save *everbody* some money in the process. The key here is to spread the word that this product has great potential for peace of mind. Peace of mind at a cost of $123 one-time purchase plus about $150/year flat-fee, regardless of the number of updates you send. Gotta’ love that. (By the way — the first set of the required lithium batteries is included with the kit.)
The SPOT web page is advertising a $50 rebate until the end of 2008 – making it about $100 now.