I'm going to have to stand corrected... I looked at tractors with cabs. The cost is far to large for the use. Even a cab on new BX is $5,000, but that has no air. And a "B" is another $5,000 over that. Trading up would cost $10-15k. Not interested in spending that kind of lettuce.
We have a Curtis cab (fiberglass roof, glass windshield, fabric back and fabric doors over a metal frame) on our BX2660.Mine is primarily a mower. I'd either need an easy-off cab for summer, or an air conditioned cab. The factory BX cab is not heated or cooled. The B-Series is. To spend the $5k for the B, plus the $5k more it costs alone over the BX just for the four months, and likely 6 uses, is not worth it to me. A canvas cab for $1000 is the way. I'm still undecided if I should sell the blower. Year #3 without it even being mounted to a tractor. It's never seen snow. Expensive dust collector.