For the cost of Regional trains (e.g. all trains from Siena to Grosseto, some of which are temporarily Trenitalia buses this week presumably due to track work) use a date this week. The cost does not change as there are no advance reductions and no reserved seats on these trains. The times of Regional trains are not online for dates past December 13.
However if you have heavy luggage, or if you prefer trains to buses, take the train. It is a very pretty journey either way.
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