For about the next 1 hour (Until around 3PM EST Saturday or they run out), Amazon is selling the Spot Satellite Messenger for $110....

I believe Mr. Ritter has pointed out that he prefers PLBs because they don't require an annual subscription (as well as other advantages of PLBs) but I thought I would point this out.

http://www.amazon.com/gp/goldbox/ref=cs_top_nav_gb27

(usual disclaimers; not affiliated in any way with Spot or Amazon)