There's a Duron 0W-30 blend and then their Arctic 0W-30 PCMO.
The 0W-30 Duron is SJ rated with a pour point of -51, and I think it is SJ rather than SL because it is a fairly high volatility oil. HTHS is right on the button for 3.5 and it is recommended for use in A3/B3 applications. It's on the heavy end of a 30 weight at 12.1 cSt, but that is understandable for a HDEO
The Arctic 0W-30 is SM rated with a pour point of -42, which is not that special considering off the shelf Mobil 1 5W-30 seems to offer similar performance specs and you can get it anywhere. $7.54 a litre at Wally World...compared to $8.52 a litre for Castrol Syntec.
0W-30 XD-3 seems to be the value leader of the group at $22.86 for four litres off the shelf at Wally World, and cheaper yet buying it branded as Arctic at UFA or buying it through an Esso distributor. Little on the thick side but a full PAO, SL rated oil.
I have heard that buying cases of the Arctic 0W-30 the price is in the $4-$5 a litre range. I have not heard anything too impressive about passenger car oils from Petro-Canada unlike their heavy duty products, however. Price-performance is off unless you buy it from the distributor which means buying a minimum of 12 to 16 litres of oil, and they haven't shown great wear numbers.
Of all the oils Petro-Canada makes, this Duron-E synthetic seems to be the most impressive, especially considering the price is around $6.25 a litre. Next to M1 0W-40 on paper it even looks pretty good, of course U0As would have to be done to see what it's like in the real world.
If they made something similar but geared a little more towards the gasoline engine side of things (it's most of the way there being SM and having a TBN of 7.6), say 10.5 cSt hot but similar/better cold specs I really don't know if dollar for dollar anything else on the market could beat it for all-season performance in the bizarre climate we have here.