I have been purchasing vacuum and pressure gauges over the years from
"George Yardley Co. Inc.".  Their phone number is 714-241-7700, hours
8 to 5 PM Pacific time.

The man to talk to is Tim Jackobson at ext. 221.  He will give us a
price of $31.32 for the 2.5 inch size gauge.  I believe the standard
ranges are 15", 30", 60", 100" water column, both in pressure and
vacuum.  To get this price, tell him that I referred you to him.

Good Luck,
Mike Ames