Since you seem to live in a moderately northern clime, you should be able to find something suitable without having to take out a second mortgage.
I've lived for over 40 years in a region where winter temps are generally below 0°F. I run (= slog = slow jog) outdoors down to ca -20°C/-4°F, sometimes colder as long as the wind chill isn't too grim.
The only gloves I've ever used over the years — and I've used a wide assortment — I've bought at Walmart (which at the moment is clearing winter stock) and have never paid more than $10 CDN for same: usually something like a nylon or polyester vinyl shell + cotton on polyester lining + Thinsulate® interlining. They more than suffice to ward off the cold.
