I'm not sure a gel-based one exists in Canada but I would be very interested in hearing about it too if one does.
I was able to find Spectro's 2.5% BP in the two Pharmaprix stores that I looked in so it's odd that Shoppers doesn't necessarily carry it elsewhere. That's a cream though. It works just fine but I'm finding Dan's gel-based BP to be superior so far (it's only been a couple of days, so it's a little soon to truly say, but so far it's superb).
For me, since I was using Spectro, it's considerably cheaper to get the BP treatment from acne.org, even with postage; Spectro was costing me about $9 after tax for a tiny 25ml bottle, compared to about $23 incl shipping for 236ml (8oz) from acne.org (tip: shipping the acne.org products is somewhat cheaper if you buy them from US Amazon for some reason). In other words, that's $36 vs $10 per 100ml and an absolute no brainer for me. So what I'm trying to say is if you can handle the slightly higher initial outlay, you might consider getting your BP from acne.org.
I couldn't seem to find the exact Clean and Clear BP product you mentioned but I noticed it has 'cleanser' in the name - is this something you're leaving on your skin or is it getting rinsed off afterwards?