What are the two primary "bid limits" for a South Dakota school district to keep in mind?

There are primarily two bid limits for a South Dakota school district to consider when entering into purchase contracts:

First, if the school district intends to enter into a contract for any public improvement that involves the expenditure of fifty thousand dollars or more.

Second, if the school district purchases supplies or services, other than professional services, that involve the expenditure of twenty five thousand dollars or more.