3 years ? I'm shocked !!! Hahaha...
Having ESS work consistantly is a great sign, for battery health. Battery Tender is definitely your friend here, knowing you also have a dash cam installed (guessing it has some sort of Park mode).
Canadian battery suppliers ? Hmmm. Not sure I know which one you mean. BTW battery prices have jumped up in the last 12 months. But I can put down a quick list right here :
Regular lead-calcium AGM H7/94R (same as original, same as Mopar replacement, etc...) : Costco (Canada) has the best price I think, on their Energizer label battery for $290 :
Canadian Tire lead-calcium AGM for $299 :
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Premium AGMs are crazy expensive (Northstar and Odyssey), but... I bought an Odyssey online for my wife's car early winter and got a great price. Since you are in the GTA (I think) you could pick one up locally and avoid shipping costs, which would make it even more appealing. The place is called GNB (Great Northern Battery) and they have stores in Hamilton and Woodbridge. Their thin plate pure lead 94R goes for $354 now :
odysseybattery.ca
(not sure how they handle core charges, maybe you get $20 back if you bring your old battery in)
Total Battery (store in Vaughan) has the Odyssey for $348 :
ODYSSEY Performance Series Battery ODP-AGM94R H7 L4 (94R-850)
webstore.totalbattery.com
For the record...Odyssey batteries in Canada go for the same MSRP as in the US. For example, Autozone (US) sells the 94R Odyssey for $338 USD... I have a feeling Odyssey will make a correction for Canada (meaning a near $100 price jump) sooner than later... so now is a good time to buy an Odyssey up here.
Northstar batteries seem to have come back to market, in Canada. Odyssey bought them out a few years ago and they became hard to find for a while. I see Batteries Expert has them back in stock, but... $445 for the 94R is ridiculous :
NSB-AGM94R BATT SEALED 840CCA 1030CA 159R/C L4/H7 COV BLUE
www.batteriesexpert.com
(they have stores in the GTA as well).
SaskBattery, where I got my Northstar (online - free shipping in Canada), are only showing one Northstar (group 48), but if you call them they might have others in stock. But their group 48 is selling for $400, and the group 48 is one size smaller than the 94R...
saskbattery.com
There is 'new' player in the premium AGM game, battery line is called Full Throttle and the company is FullRiver. I first saw a battery from them on the Batteries Expert site about a year ago. Searched a bit to realize it's a China based outfit. No idea how good they are, but... at $520 CDN, I'll pass :
FT850-94R Cranking Battery (AGM) Group 94R 12V
www.tced.ca
(it's rated for 850 CCA)
A bunch of typo edits