One can spend amazing amounts of money doing it, too. A hose that cost
me $22 from Northern Tool was quoted at $110-$120 by several local
shops. One of them looked at it and said he couldn't believe they made
a profit since it was the same type of hose and fitting he used. Of
course they can make up whatever you need while you wait, to get your
$100,000 machine running again today.
I am learning to recalculate working stresses on the fly while looking
over a dealer's pile of orphan cylinders and valves. The cylinders for
the front end loader I built last fall cost $15 - $20 each.