Yep, be thankful you have an office...
I really dont have a problem with the colour laser at my school, once we introduced printer credits and set the value of credits to 20 per sheet (which works out at around 1 page per week at the current rate for pupils) no-one uses the colour unless its needed for coursework.
The printer sits right behind me in the ICT suite, so I guess most pupils dont even try printing something they shouldnt unless I get up and take a look at what they are printing.