Where can I get repair parts for my SPL-710SH Shredder from Staples?

Where can I get repair parts for my SPL-710SH Shredder from Staples? There is safety toggle that is activated when the shredder hed is inserted into the collector bin. It has broken and now the shredder head cannot detect if there is paper in the shredder slot. There is a plate with 4 screws that can be removed to remove and replace the toggle bar. It is plastic.