Delayed approval of an urgent 3-figure purchase resulting in a 5-6 figure loss in productivity, customer sat, etc. Great example of penny-wise, pound-foolish!
Buying individual drives to shave a few pennies is pretty foolish to begin with, so why stop there!
Make it an OEM problem.
In their defense, we had a bunch of drives coming in in a month. It's just that we ran out of spares faster than expected (we had to increase capacity in a couple servers on short notice).