A lot depends on location, shape of tractor and attachments.
There's on by me (NY) with blower, cab, weights and chains for $1800. I bought mine with mower deck few years ago for $800 in good shape So buying a 140-h3 with snowblower attachment & weights is good for $700 even doe engine isn't working ..was told it needs a good tune-up ..but what if the engine is shot ? will it still be worse it you think ?
well I screwed that up and waited too long some one else got it so thanks ..live and learn$700 is a very fair price if everything is in decent condition. A 49 snowthrower usually sells for $500-700 in my area and cast iron wheel weights are $200+.