You can still find the Delorme branded InReach devices, which are less expensive than the Garmin branded versions (but they are still more expensive than a SPOT device).

The advantage to the InReach system is two-way communication via text, which could be very useful in an emergency situation to speak to dispatch or first responders en route, or to receive emergency messages from family and friends.

The other advantage is that InReach plans only have a one-month minimum. Activation/reactivation fees are about $30, or you can temporarily suspend service indefinitely at about $3 a month (note I am quoting Canadian pricing, and US plans are likely a bit cheaper).