the roof on my hutch opens, so I have clear shower curtain over the top hutch part permanently stapled, and cover the whole lot up including run underneath, with cheap rugs at night, held down with nursery fireguards which I use as mobile fencing in the day. That lot cost me about £40 so the hutch snuggle's not that bad a price and looks better, but I doubt it's as well ventilated. Plus in bad weather my hutch still has plastic over the wire keeping it dry, and I fold down one of the rugs to shelter the run in the day if it's really horrible. the water's only frozen once this winter but it's near the house so quite sheltered.
Alternatively you could use a garden bench cover over an old duvet - that would only cost a few £'s but they get a bit spooked by anything too rustly when it's windy, and it would be a bit of a pain taking it off in wet weather - same goes for hutch snuggle though.