Poor Man's Netclock?

We would like a standaloine device that can serve as an ntp time source.
A known device is Sprectracom's Netclock 9489 (appx $3600).

Is there a similar device that is cheaper?

More Background:
The netclock will provide time to a private LAN that is NOT connected to any other LAN (or the internet).
We could use a linux/Windows box with dual NIC's and have that box grab the time on the internet side and provide ntp to the private LAN side.
However, we would prefer a standalone device that is not connected to any other network.
dpsitAsked:
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Dave BaldwinFixer of ProblemsCommented:
The main question is what kind of accuracy do you require?  Internet NTP sources are usually traceable to NIST or Naval Observatory time which is microsecond accurate.  You could theoretically use the clock in one of the PCs on that network as your common time source.  It is very cheap but only a little more accurate than counting out load.
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dpsitAuthor Commented:
The accuracy requirement is not particularly onerous ... to within a second or two is fine.
Thus syncing to one of the NIST time sources you mention would be fine.

However, as stated, the private LAN (and all devices on it) do not have internet connectivity.
Thank you.
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Dave BaldwinFixer of ProblemsCommented:
Here's one that uses GPS for $585: http://www.gpsntp.com/   And they have a cheaper one: http://www.gpsntp.com/economic-ntpserver.php
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dpsitAuthor Commented:
Dave Baldwin: This looks very interesting and the price is certainly right!
Have you tried any of their products/know someone who has?

Doing a general web search, I haven't been able to find any reviews about the product and very little about the company.
Also I sent them a web form request yesterday but haven't received anything back.
Their twitter feed is from 2009 ... so it is hard to understand if they are still an active business.

Thank you!
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Dave BaldwinFixer of ProblemsCommented:
No, I have never needed a stand-alone clock like that.  I'm always sync'd to one of the main NTP sources.  There may be others that use GPS for a clock source.  GPS time is derived from NIST or Naval Observatory time.
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