Security Monitoring Service

Like a call center, monitor and respond to security events at residences.  This service has been around for decades.  SmartHome's service starts at "only $8.95 a month."  This targets self-installed monitoring hardware.

Full-service customer support center - Staffed by experts - UL-Listed Central Station
 Compatible with most security systems on the market

One-Third the Price of Other Monitoring Services

Annual in Advance Alarm Monitoring Service : $8.95 per month
Alarm Monitoring: $107.40 per year
Setup (One Time): $35.00
Total upfront costs: $142.40

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This do it yourself service requires purchase of their hardware.  Startup $360.