Broken rear shock

I’ve been slamming this machine into snow for 10 years and it has done me right. This summer, on my first ever trail ride, the right swingarm pivot backed out and I ended up breaking the shock.

As it is really just used as a plow, what is a low cost replacement shock?

I guess I don’t really want to upgrade as then I’ll feel obligated to do the same up front.

’03 Rancher 350es 4×4