Well, quick email, quick reply. They are distributed in Canada through R. Nicholls. Gov. Sales.
Here's what they have to say:
P/N: 71G710
Description: RM EQUIPMENT M203 Grip, Tactical Handle
Unit cost: $315.00
P/N: 71G730
Description: RM EQUIPMENT M203 Grip, Tactical Handle, Tactical Light
Unit cost: $475.00
Note 1: based on testing at the Infantry School at CFB Gagetown, the Classic Handle was not recommended as it is too long; which is why we have sent you this quote for the Tactical Handle.
Note 2: if you place an order, it must be delivered to a Military address as it is a Controlled Goods Item under the CGRP.
Note 4: if you place an order, an electronic copy of a DSP-83 form (End User Certificate) will be required and must be signed by an Authorized DND representative at NDHQ and must then be returned to our head office for processing.
I'm guessing perhaps some people managed to get it "issued", or paid for by their units. I'm also interested in it, if anyone did manage to pay for them, and have them used and want to sell them. Logos has shotgun on it obviously.