This kind of thing makes me crazy and happens more than one would think. The regulations regarding bidding..etc are very clear in this state.
My agency uses Amazon frequently because in most cases, you just can't beat the prices.
When money is wasted in this way..the ones that suffer are the students. Funny..there is so much oversight from the state regarding Charter schools...I guess not so much regarding traditional public schools.
Not only should the purchasing people be fired..but the overseers as well...including those in the finance department who signed off on these expenses.

Regarding the extra credit question, I am going with "D".