[Amazon.ca] Pentel Super Hi-Polymer Lead Refills, 0.5mm, HB, Black, 12 Leads per Tube - $1.99
This is a pretty dirt cheap deal, lead for lead pencils 12 packs of 12 leads per pack.
https://www.amazon.ca/Pentel-Super-Hi-P ... B001HA5SYK
https://www.amazon.ca/Pentel-Super-Hi-P ... B001HA5SYK