Typical GPS based NTP server appliances sell for hundreds, even thousands of dollars. Most have lots of features that justify that cost, such as an ovenized crystal oscillator or even a rubidium standard, additional frequency outputs, custom web interface, commercial support, etc. Building your own basic NTP server like in this article can be done on the cheap for well under 200 USD, and for all practical purposes gives just as good time over a network.
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