Michigan & privatization of school custodians

Found this interesting2009 link from the Mackinac Center regarding the 18 school districts in Michigan that have privatized their school custodial services.

 
Outsourcing custodial services continued to show impressive savings for districts, including:
Southfield Public Schools custodial services expects to save between $2.5 million and $3 million over the next three years.[*] 

This is roughly equal to between $94 and $114 per pupil per year.
Kalkaska Public Schools saves between $275,000 and $300,000 a year. That means it is saving between $158 and $173 per pupil per year for its 1,736 students.

Garden City Public Schools saves just over $1 million a year, or $184 per pupil per year.