The Math Department needs white chalk.
Their preferred brand is Prang White Chalk which you can find at this link at Staples.  

They have plenty of mulitcolor chalk but White is needed. 
If you pick some up at your next trip to Staples drop it off at the office attention Mr. Vriesman.
If you want to buy online have it delivered to school attention: Mr. Vriesman. 

Your help is appreciated by our math teachers and our students.