To-Be-Released (TBR) is a weekly process managed by CIRA that releases all deleted .CA domains back for registration. Every week, a list of previously registered domains that have been deleted becomes available. You can see the list with weekly domains here.
If you are interested in acquiring a to-be-released .CA domain(s), please send as an email with the details - list of the domains you are interested in, and the maximum bid for each domain, and we'll get back to you to discuss your request further.