Koodo will not price match. Not only that, but Koodo's offers are a completely different structure. Even Télus would rather you go to them than Koodo for such a device.
The latest more expensive phones (flagships) (such as the Galaxy S8+) will usually be cheaper (what you'll pay upfront plus what you'll pay over 24 months) with the big tier (Rogers/Bell/Télus).
You'll get better deals on the Galaxy S8+ on Koodo by the time the Galaxy S10 is out. By then, carriers will be liquidating the phone, and you could get the phone at a crazy discount from Koodo.