Pause

Stephen Covey mentions the great impact the following quote had on him when he came across it:

Between stimulus and response, there is space.
In that space lies our freedom and power to choose our response.
In our response lies our growth and our happiness.

To put it simply, when something happens, pause and think before you react. In this way you can react in the way that is best.

Vendor Selection

Remember when selecting a vendor, you shouldn't always go with the vendor with the lowest price. Select a vendor that you can establish a partnership with, or that you can use for more things. These relationships tend to be more beneficial.