Bulk discounts show up if you log in. At the time of this comment:
Buy 4 for CA$39.96 each and save 0%
Buy 8 for CA$38.24 each and save 4%
Buy 12 for CA$36.95 each and save 8%
Buy 25 for CA$35.67 each and save 11%
Buy 50 for CA$34.81 each and save 13%
Shame I don't know anyone that wants to go in for a group order.