Hello,
My husband and I are planning to go to Pienza in June and we are trying to find the cheapest way to get there since we are not renting a car. Once we get to Pienza we will explore via bike tour. In general our budget is tight and when I checked, a one way taxi from Florence is around 170 Euros! So for round trip it will be 300 or more.

We have an option to go to Siena instead but again, I suppose taxi to Pienza will still be 100 Euro each way? We would like to take a bus but we don't know where to go to find it and such. We plan to take train from Malpensa to Siena, so where would the bus to Pienza be from here?

At least one way by bus, would save us a lot. Bear in mind, we arrive on the 9th which is Saturday around 4pm - will that be a problem?