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The up-front costs can be ugly though, unless you can find someone needing
to get rid of a rack.
The new racks are expensive; there's a 48U rack in a computer store
nearby for over $2000. Surplus is much more reasonable: with any luck,
sometimes people beg you to take it off their hands. Watch for keyword
'relay rack', because that's how 19" began their life.
Me, I am not proud. I just bought aluminum C-rail (1/2" crossection)
in Home Despot for around $1/feet, and used sheet metal screws to
attach it to wire shelves in my closet at the proper distance of 18.3"
(http://www.brenclosures.com.au/19-inch-rack.htm). The equipment is
attached to the rack with self-drilling sheet metal screws.
Re. running multiple servers, remember that one Watt per year costs
one dollar at current electricity prices. Save the planet and keep the
money in your pocket by running virtual machines, especially for
training purposes---the best thing is that you can snapshot a machine,
proceed to screw it up royally and restore from snapshot.
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