The Competition Commission says several schools are operating like cartels when it comes to selling school uniforms.
The agreements will bind schools to contract school uniform suppliers through transparent and competitive bidding processes. Agreements will also be for a limited period.
The commission says school uniforms should not make it difficult for pupils to receive an education.
Scores of parents lined up outside uniform and stationery shops for last minute preparations as the school year begins.
Some parents were forced to leave it to the last minute as their children were placed at schools later than expected.
The commission instituted investigations and conducted a survey into the R10 billion industry after receiving complaints about the high prices last year.
In late 2016, the Competition Commission launched a probe into the high cost of uniforms.
Earlier this week, pupils at a Pretoria high school boycotted classes and demanded to be allowed to wear skinny pants at school.
